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Tent function, often used in signal processing
A triangular function (also known as a triangle function, hat function, or tent function) is a function whose graph takes the shape of a triangle. Often
Triangular_function
Figurate number
The triangular numbers or triangle numbers are the sequence of positive integers that can be represented as a lattice of points arranged in an equilateral
Triangular_number
Probability distribution
The symmetric triangular distribution is commonly used in audio dithering, where it is called TPDF (triangular probability density function). Trapezoidal
Triangular_distribution
Function whose graph is 0, then 1, then 0 again, in an almost-everywhere continuous way
The rectangular function (also known as the rectangle function, rect function, Pi function, Heaviside Pi function, gate function, unit pulse, or the normalized
Rectangular_function
Non-sinusoidal waveform
playing this file? See media help. A triangular wave or triangle wave is a non-sinusoidal waveform named for its triangular shape. It is a periodic, piecewise
Triangle_wave
Type of mathematical function
piecewise constant function Boxcar function, Heaviside step function Sign function Triangular function An approximation to a known curve can be found by sampling
Piecewise_linear_function
Topics referred to by the same term
Tri or El Tricolor, nicknames of the Mexico national football team Triangular function, tri(t) Trichloroethylene Triple reuptake inhibitors Trisakti University
Tri
Electronic test equipment used to generate electrical waveforms
of the most common waveforms produced by the function generator are the sine wave, square wave, triangular wave and sawtooth shapes. These waveforms can
Function_generator
Model in digital signal processing
{rect} (x)\ } is the rectangular function and t r i ( x ) {\displaystyle \mathrm {tri} (x)\ } is the triangular function. The effective frequency response
First-order_hold
Mathematical description of quantum state
In quantum mechanics, a wave function (or wavefunction) is a mathematical description of the quantum state of an isolated quantum system. The most common
Wave_function
Mathematical form
convolution. Under the Fourier transform, convolution becomes point-wise function multiplication. The product of two polynomials is given by the following:
Product_(mathematics)
Centered figurate number that represents a triangle with a dot in the center
OEIS). If the centered triangular numbers are treated as the coefficients of the McLaurin series of a function, that function converges for all | x |
Centered_triangular_number
Result of repeatedly applying a mathematical function
In mathematics, an iterated function is a function that is obtained by composing another function with itself two or several times. The process of repeatedly
Iterated_function
Method of representing curves and surfaces in computer graphics
non-zero. As mentioned before, N i , 1 {\displaystyle N_{i,1}} is a triangular function, nonzero over two knot spans rising from zero to one on the first
Non-uniform_rational_B-spline
Function used in signal processing
processing and statistics, a window function (also known as an apodization function or tapering function) is a mathematical function that is zero-valued outside
Window_function
square number, Mertens function zero 1014 = 210-10, Mertens function zero, sum of the nontriangular numbers between successive triangular numbers 78 and 91
1000_(number)
Integer that is both a perfect square and a triangular number
In mathematics, a square triangular number (or triangular square number) is a number which is both a triangular number and a square number, in other words
Square_triangular_number
Anatomical feature in the wrist
The triangular fibrocartilage complex (TFCC) is formed by the triangular fibrocartilage discus (TFC), the radioulnar ligaments (RULs) and the ulnocarpal
Triangular_fibrocartilage
Type of figurate number
properties of oblong, triangular, and square numbers. The number 10 for example, can be arranged as a triangle (see triangular number): But 10 cannot
Polygonal_number
Product of an integer with itself
integer Quadratic function – Polynomial function of degree two Square triangular number – Integer that is both a perfect square and a triangular number Some
Square_number
speed, -w. Assuming the fundamental diagram (flow-density) is a triangular function, a traffic state A with speed vA and density kA can be assumed in
Newell's_car-following_model
Integer having a non-trivial divisor
Sieve of Eratosthenes Table of prime factors Divisor function Prime omega function Möbius function Pettofrezzo & Byrkit 1970, pp. 23–24. Long 1972, p. 16
Composite_number
Mathematical transform that expresses a function of time as a function of frequency
takes a function as input and outputs another function that describes the extent to which various frequencies are present in the original function. The output
Fourier_transform
Natural number
second-smallest Erdős–Nicolas number, triangular number, number of 5-cubes in a 9-cube, 211 – 25 2017 – Mertens function zero, sexy prime with 2011 2018 –
2000_(number)
Spline function
ranges. For example, B i , 1 ( x ) {\displaystyle B_{i,1}(x)} is a triangular function that is zero below x = t i {\displaystyle x=t_{i}} , ramps to one
B-spline
Square of a triangular number
number theory, the sum of the first n cubes is the square of the nth triangular number. That is, 1 3 + 2 3 + 3 3 + ⋯ + n 3 = ( 1 + 2 + 3 + ⋯ + n ) 2
Squared_triangular_number
Topics referred to by the same term
statistics Hat operator, notation used in mathematics Hat function, alternate name for the triangular function The hat tile, a solution to the einstein problem
Hat_(disambiguation)
y}}} . So the derivation of triangular codes of a function F ( x ) {\displaystyle F(x)} consists in determining the triangular code of the partial derivative
Computer for operations with functions
Computer_for_operations_with_functions
Psychological theory by Robert Sternberg
The triangular theory of love is a theory of love developed by Robert Sternberg. In the context of interpersonal relationships, "the three components of
Triangular_theory_of_love
Scale-free network generation algorithm
spectral density is not an exact triangular function by analyzing the moments of the spectral density as a function of the power-law exponent. Model A
Barabási–Albert_model
Ten raised to an integer power
Centered nonagonal Centered decagonal Star non-centered Triangular Square Square triangular Pentagonal Hexagonal Heptagonal Octagonal Nonagonal Decagonal
Power_of_10
Class of natural numbers with many divisors
{d(n)}{n^{\varepsilon }}}\geq {\frac {d(k)}{k^{\varepsilon }}}} where d(n), the divisor function, denotes the number of divisors of n. The term was coined by Ramanujan
Superior highly composite number
Superior_highly_composite_number
Numbers with a certain property involving recursive summation
eventually reaches 1 when iterated over the perfect digital invariant function for p = 2 {\displaystyle p=2} . The origin of happy numbers is not clear
Happy_number
Function whose domain is the positive integers
prime-counting functions. This article provides links to functions of both classes. An example of an arithmetic function is the divisor function whose value
Arithmetic_function
Integer filtered out using a sieve similar to that of Eratosthenes
Centered nonagonal Centered decagonal Star non-centered Triangular Square Square triangular Pentagonal Hexagonal Heptagonal Octagonal Nonagonal Decagonal
Lucky_number
Number divisible only by 1 and itself
the zeros of the Riemann zeta function ζ ( s ) {\displaystyle \zeta (s)} are located. This function is an analytic function on the complex numbers. For
Prime_number
Recursive integer sequence
binomial coefficients, by Stirling's approximation for n!, or via generating functions. The only Catalan numbers Cn that are odd are those for which n = 2k −
Catalan_number
Polyhedral number representing a tetrahedron
A tetrahedral number, or triangular pyramidal number, is a figurate number that represents a pyramid with a triangular base and three sides, called a
Tetrahedral_number
Type of composite number with an even number of digits
Centered nonagonal Centered decagonal Star non-centered Triangular Square Square triangular Pentagonal Hexagonal Heptagonal Octagonal Nonagonal Decagonal
Vampire_number
Coordinate system that is defined by points instead of vectors
coordinates are extremely useful in engineering applications involving triangular subdomains. These make analytic integrals often easier to evaluate, and
Barycentric_coordinate_system
Number equal to the sum of its proper divisors
_{1}(n)=2n} where σ 1 {\displaystyle \sigma _{1}} is the sum-of-divisors function. This definition is ancient, appearing as early as Euclid's Elements (Book
Perfect_number
Triangular prism capped with tetrahedra
The elongated triangular bipyramid or elongated triangular dipyramid is a polyhedron constructed from a triangular prism by attaching two regular tetrahedra
Elongated triangular bipyramid
Elongated_triangular_bipyramid
Iterative algorithm on numbers
sequence. Repeat step 2. The sequence is called a Kaprekar sequence and the function K b ( n ) = α − β {\displaystyle K_{b}(n)=\alpha -\beta } is the Kaprekar
Kaprekar's_routine
Number that represents a hexagon with a dot in the center
centered hexagonal number for n is 1 more than 6 times the (n − 1)th triangular number. In the opposite direction, the index n corresponding to the centered
Centered_hexagonal_number
Number used for counting
a list of objects in a specific order. More precisely, a sequence is a function that assigns an object to each position in that list. The positions themselves
Natural_number
Figurate number
A pentagonal number is a figurate number that extends the concept of triangular and square numbers to the pentagon, but, unlike the first two, the patterns
Pentagonal_number
Numbers arranged in a triangle
In mathematics and computing, a triangular array of numbers, polynomials, or the like, is a doubly indexed sequence in which each row is only as long as
Triangular_array
Formal power series
generating function is a representation of an infinite sequence of numbers as the coefficients of a formal power series. Generating functions are often
Generating_function
Numbers k where x - phi(x) = k has many solutions
{\displaystyle k} and above 1. Here, ϕ {\displaystyle \phi } is Euler's totient function. There are infinitely many solutions to the equation for k {\displaystyle
Highly_cototient_number
Natural number
the eighth triangular number or the sum of the first eight non-zero positive integers, which makes 36 the first non-trivial square triangular number. Aside
36_(number)
Product of two prime numbers
where π ( x ) {\displaystyle \pi (x)} is the prime-counting function and p k {\displaystyle p_{k}} denotes the kth prime. To see this, take
Semiprime
Numbers obtained by adding the two previous ones
that 8 and 144 are the only such non-trivial perfect powers. The only triangular Fibonacci numbers are 1, 3, 21, and 55, which was conjectured by Vern
Fibonacci_sequence
Type of Poulet number
Centered nonagonal Centered decagonal Star non-centered Triangular Square Square triangular Pentagonal Hexagonal Heptagonal Octagonal Nonagonal Decagonal
Super-Poulet_number
{\displaystyle {\frac {1}{2^{n+1}}}\cdot \delta } . The triangular function is a refinable function. B-spline functions with successive integral nodes are refinable
Refinable_function
Number raised to the third power
n × n × n. The cube function is the function x ↦ x3 (often denoted y = x3) that maps a number to its cube. It is an odd function, as (−n)3 = −(n3). The
Cube_(algebra)
Main external rotator of the shoulder
thick triangular muscle which occupies the chief part of the infraspinatous fossa. As one of the four muscles of the rotator cuff, the main function of the
Infraspinatus_muscle
Infinite integer series where the next number is the sum of the two preceding it
− 4 ( 18 ) + 6 {\displaystyle 256=322-4(18)+6} The ordinary generating function of the sequence of Lucas numbers is the power series Φ ( x ) = ∑ k = 0
Lucas_number
Product of numbers from 1 to n
The superfactorials are continuously interpolated by the Barnes G-function. Triangular number Just as the n {\displaystyle n} th factorial is the product
Factorial
Type of figurate number
number is a triangular number, but only every other triangular number (the 1st, 3rd, 5th, 7th, etc.) is a hexagonal number. Like a triangular number, the
Hexagonal_number
Two raised to an integer power
Centered nonagonal Centered decagonal Star non-centered Triangular Square Square triangular Pentagonal Hexagonal Heptagonal Octagonal Nonagonal Decagonal
Power_of_two
Description of continuous random distribution
probability density function (PDF), density function, or simply density of an absolutely continuous random variable, is a function whose value at any given
Probability_density_function
Special function in the physical sciences
transform. The Airy function is the solution to the time-independent Schrödinger equation for a particle confined within a triangular potential well and
Airy_function
Type of symmetric key cipher
function. Instead of a linear driving device, one may use a nonlinear update function. For example, Klimov and Shamir proposed triangular functions (T-functions)
Stream_cipher
Numbers parameterizing ways to partition a set
second kind can be understood as inverses of one another when viewed as triangular matrices. This article is devoted to specifics of Stirling numbers of
Stirling numbers of the second kind
Stirling_numbers_of_the_second_kind
Type of composite integer
{\displaystyle n} be a natural number. For base b > 1 {\displaystyle b>1} , let the function F b ( n ) {\displaystyle F_{b}(n)} be the digit sum of n {\displaystyle
Smith_number
Algorithm on systems of polynomials
In computer algebra, a triangular decomposition of a polynomial system S is a set of simpler polynomial systems S1, ..., Se such that a point is a solution
Triangular_decomposition
Number used to approximate the square root of 2
approximate the square root of two, Pell numbers can be used to find square triangular numbers, to construct integer approximations to the right isosceles triangle
Pell_number
Integers occurring in the coefficients of the Taylor series of 1/cosh t
Taylor series expansions of the secant and hyperbolic secant functions. The latter is the function in the definition. They also occur in combinatorics, specifically
Euler_numbers
Arithmetic operation
function xy has no limit at the point (0, 0). One may consider at what points this function does have a limit. More precisely, consider the function f
Exponentiation
Size of a geometric arrangement of points
different writers for members of different sets of numbers, generalizing from triangular numbers to different shapes (polygonal numbers) and different dimensions
Figurate_number
Natural number, composite number
vertices and 14 triangular faces, respectively. Steffen's polyhedron, the simplest flexible polyhedron without self-crossings, has 14 triangular faces. A regular
14_(number)
Type of number introduced by Mike Keith
Centered nonagonal Centered decagonal Star non-centered Triangular Square Square triangular Pentagonal Hexagonal Heptagonal Octagonal Nonagonal Decagonal
Keith_number
Count of permutations by cycles
factorial function, n ! = n ( n − 1 ) ( n − 2 ) ⋯ 2 ⋅ 1 {\displaystyle n!=n(n-1)(n-2)\cdots 2\cdot 1} , we may extend this notion to define triangular recurrence
Stirling numbers of the first kind
Stirling_numbers_of_the_first_kind
Natural number
zero of Mertens function, a Harshad number and a pentagonal pyramidal number. 406 = 2 × 7 × 29. It is a sphenic number, the 28th triangular number, a centered
400_(number)
Matrix decomposition method
is upper triangular. A flag can be passed to use the lower triangular factor instead. In R, the chol function returns the upper triangular Cholesky factor
Cholesky_decomposition
Number that is the result of operation on its own digits
Centered nonagonal Centered decagonal Star non-centered Triangular Square Square triangular Pentagonal Hexagonal Heptagonal Octagonal Nonagonal Decagonal
Friedman_number
Natural number
+ 243). The sum of Euler's totient function φ(x) over the first thirty-four integers is 360. 360 is a triangular matchstick number. 360 is the product
360_(number)
Number that remains the same when its digits are reversed
Centered nonagonal Centered decagonal Star non-centered Triangular Square Square triangular Pentagonal Hexagonal Heptagonal Octagonal Nonagonal Decagonal
Palindromic_number
Difference between logarithm and harmonic series
Reciprocals of Triangular Numbers". Mathematics Magazine. 64 (3): 167. doi:10.1080/0025570X.1991.11977600. Edwards, H. M. (1974). Riemann's Zeta Function. Pure
Euler's_constant
Natural number
8001 – triangular number 8002 – Mertens function zero 8011 – Mertens function zero, super-prime 8012 – Mertens function zero 8017 – Mertens function zero
8000_(number)
Chinese national flag (1889–1912)
Banners hierarchy, he instead removed one corner to create a triangular flag. The triangular version of the yellow dragon flag was restricted to naval and
Flag_of_the_Qing_dynasty
Number of stacked spheres in a pyramid
into two consecutive triangular numbers. If a tetrahedron is reflected across one of its faces, the two copies form a triangular bipyramid. The square
Square_pyramidal_number
Mathematical approximation of a function
of a function is an infinite sum of terms that are expressed in terms of the function's derivatives at a single point. For most common functions, the
Taylor_series
Numbers with many divisors
a largely composite number if d(n) ≥ d(m) for all m ≤ n. The counting function QL(x) of largely composite numbers satisfies ( log x ) c ≤ log Q L
Highly_composite_number
Type of matrix factorization
decomposition which decomposes a matrix into a lower triangular matrix (L), an upper triangular matrix (U) and, although not always needed, a permutation
Crout_matrix_decomposition
Natural number
{\displaystyle 0} for the Mertens function (2 and 39) have a difference of 37, where their product (2 × 39) is the twelfth triangular number 78. Meanwhile, their
37_(number)
Concept in number theory
Let n {\displaystyle n} be a natural number. We define the narcissistic function for base b > 1 {\displaystyle b>1} F b : N → N {\displaystyle F_{b}:\mathbb
Narcissistic_number
Numbers that evenly divide powers of 60
the harmonic whole numbers. Wikifunctions has a regular number checking function. Algorithms for calculating the regular numbers in ascending order were
Regular_number
Shape with three sides
generalized notion of triangles known as the simplex, and the polytopes with triangular facets known as the simplicial polytopes. Each triangle has many special
Triangle
Early stage product design and development technique
replaced with circles, and the triangular "roof" is missing. Akao, Yoji (1994). "Development History of Quality Function Deployment". The Customer Driven
Quality_function_deployment
Uniform distribution on an interval
it is contained in the distribution's support. The probability density function of the continuous uniform distribution is f ( x ) = { 1 b − a for a ≤
Continuous uniform distribution
Continuous_uniform_distribution
Human chest muscle that protracts the shoulder
Pectoralis minor muscle (/ˌpɛktəˈrælɪs ˈmaɪnər/) is a thin, triangular muscle, situated at the upper part of the chest, beneath the pectoralis major in
Pectoralis_minor
Divergent series
4 + ⋯ is a divergent series. The nth partial sum of the series is the triangular number ∑ k = 1 n k = n ( n + 1 ) 2 , {\displaystyle \sum _{k=1}^{n}k={\frac
1_+_2_+_3_+_4_+_⋯
Mathematical proportionality to a square
polynomial. Certain integer sequences such as the triangular numbers. The n {\displaystyle n} th triangular number has value n ( n + 1 ) / 2 {\displaystyle
Quadratic_growth
Repeated sum of a number's digits
which allows it to be used as a divisibility rule. The formula for the function d r b : N → ⋃ k = 0 b − 1 { k } , b ∈ N ⩾ 2 {\displaystyle \mathrm {dr}
Digital_root
Features that define a (ship) sail's shape and function
to the vessel (e.g. fore-and-aft) and its shape, (e.g. (a)symmetrical, triangular, quadrilateral, etc.). Sails are typically constructed out of flexible
Sail_components
Concept in theoretical computer science
1962 paper, Radó defined two functions related to the busy beaver game: the score function Σ(n) and the shifts function S(n). Both take a number of Turing
Busy_beaver
Composite number in number theory
precisely when the nth-power-raising function pn from the ring Zn of integers modulo n to itself is the identity function. The identity is the only Zn-algebra
Carmichael_number
Muscle in the thenar compartment
The opponens pollicis is a small, triangular muscle in the hand, which functions to oppose the thumb. It is one of the three thenar muscles. It lies deep
Opponens_pollicis_muscle
Mathematical function used in cryptography
a T-function is called triangular. Thanks to their bijectivity (no collisions, therefore no entropy loss) regardless of the used Boolean functions and
T-function
TRIANGULAR FUNCTION
TRIANGULAR FUNCTION
Surname or Lastname
English
English : habitational name from a lost or unidentified minor place, possibly in East Anglia, where the name is most common, and probably so called from Old English gÄra ‘gore’, ‘triangular piece of land’ + wudu ‘wood’.
Surname or Lastname
English
English : metonymic occupational name for a maker of garlands or chaplets, perhaps also a habitational name from a house sign. The word is first attested in the 14th century, from Old French, and appears to be of Germanic origin.English : habitational name from a minor place, such as Garland in Chulmleigh, Devon, named from Old English gÄra ‘triangular piece of land’ (see Gore) + land ‘cultivated land’, ‘estate’.
Boy/Male
American, Australian, British, Christian, English, German
Hill Near Meadows; Triangular Hill; Spacious Fort
Surname or Lastname
English
English : habitational name from any of various places, for example in Kent and Wiltshire, named Gore, from Old English gÄra ‘triangular piece of land’ (a derivative of gÄr ‘spear’, with reference to the triangular shape of a spearhead).French : nickname for a gluttonous and idle individual, from Old French gore ‘sow’ (of allegedly imitative origin, reflecting the grunting of the animal).
Surname or Lastname
English
English : probably a habitational name from a lost or unidentified place, generally from a field name denoting a triangular area, Old English gÄra (see Gore) at the corner of an open field after rectangular furlongs had been laid out.Jewish : Americanized form of one or more like-sounding Jewish surnames.U.S. President James Abram Garfield (1831–81) was preceded by at least six Garfields born in America, his immigrant ancestor having come to Massachusetts Bay with John Winthrop in 1630.
Boy/Male
English American
From the triangular field. From an Old English surname and place name, meaning 'field of spears'.
Boy/Male
British, English
Spear; Wedge-shaped Object; Triangular Shaped Piece of Land
Boy/Male
English
Lives in the triangular farm stead.
Boy/Male
English
From the triangular field.
Boy/Male
American, British, English
Battlefield; From the Triangular Field
Surname or Lastname
English (Kent)
English (Kent) : apparently a habitational name from a lost or unidentified place, possibly so named from Old English gÄra ‘triangular piece of land’ + hÄm ‘homestead’.Born in England, John Gorham emigrated to MA and in 1643 married Desire Howland, daughter of John Howland, who came to America on the Mayflower. His descendant Nathaniel (1738–96) was born in Charlestown, MA, and was one of the signers of the Declaration of Independence.
Boy/Male
African, American, Anglo, Australian, British, Christian, English, Jamaican
Battlefield; Spear Field; Triangular Field
Boy/Male
American, Anglo, Australian, British, Celtic, English, French, Gaelic, Irish, Scottish
Hill Near the Meadow; Triangular Hill; Hero; Large Fortification; Fortress
Boy/Male
Anglo, Australian, British, English, French
From the Cornered Hill; Hill Near Meadows; Triangular Hill
Boy/Male
American, Anglo, Australian, British, Chinese, Christian, Danish, English, French, German, Irish, Jamaican, Scottish
Hill Near the Meadow; From the Cornered Hill; Triangular Hill; Large Fortification; From the Marshes; One of Scotland's Great Clans; Spacious Fort
Girl/Female
American, Australian, Christian, Greek, Hebrew
Triangular River Mouth; Mouth of a River; Fourth Letter of Greek Alphabet; A Name for a Fourth Child; Fourth Letter of the Greek Alphabet
Boy/Male
American, Anglo, Australian, British, English
From the Triangle Shaped Settlement; Lives in the Triangular Farm Stead
Male
English
English surname transferred to forename use, possibly originally a habitational name derived from a place named from Old Norse gafl, GABLE means "gable," a term used to denote a "triangular-shaped hill."Â
Surname or Lastname
English
English : habitational name from Garton in East Yorkshire or from various minor places so named, from Old English gÄra ‘triangular plot of land’ + tÅ«n ‘farmstead’.
Boy/Male
American, British, English
Lives in the Triangular Farm Stead
TRIANGULAR FUNCTION
TRIANGULAR FUNCTION
Boy/Male
Tamil
A small garden
Boy/Male
Greek
Farmer.
Boy/Male
Tamil
Bhawanesh | பாவாநேஷ
Owner of the house
Boy/Male
Muslim
Liberal donor
Boy/Male
Tamil
Name of a Guru
Boy/Male
Tamil
Another name of Lord krishnas Bansari flute). like Banshi in Hindi language
Boy/Male
Tamil
King of serpents vaasuki
Girl/Female
Hindu, Indian, Kannada, Malayalam, Marathi, Telugu
Full of Love; Pearl; Goddess Lakshmi / Saraswati
Girl/Female
Biblical
Answer, song, affliction.
Girl/Female
Tamil
Adritya | அதà¯à®°à¯€à®¤à¯à®¯à®¾
The Sun
TRIANGULAR FUNCTION
TRIANGULAR FUNCTION
TRIANGULAR FUNCTION
TRIANGULAR FUNCTION
TRIANGULAR FUNCTION
a.
Having three angles; triangular.
a.
Designating several triangular muscles called scalene muscles.
a.
Nearly, but not perfectly, triangular.
a.
Having three angles; having the form of a triangle.
p. pr. & vb. n.
of Triangulate
n.
A solid having forty-eight equal triangular faces.
adv.
In a triangular manner; in the form of a triangle.
n. pl.
The triangular, or maioid, crabs. See Illust. under Maioid, and Illust. of Spider crab, under Spider.
v. t.
To make triangular, or three-cornered.
v.
A small traingular piece of land.
a.
Biangular.
a.
Shaped like the Greek / (delta); delta-shaped; triangular.
n.
A kind of triangular lyre or harp.
imp. & p. p.
of Triangulate
a.
Oblong or elongated, and having three lateral angles; as, a triangular seed, leaf, or stem.
n.
A triangular chisel.
n.
A kind of triangular spade.
a.
Biangular.
v. t.
To divide into triangles; specifically, to survey by means of a series of triangles properly laid down and measured.
n.
The quality or state of being triangular.