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Tiling of the hyperbolic plane
the heptagonal tiling is a regular tiling of the hyperbolic plane. It is represented by Schläfli symbol of {7,3}, having three regular heptagons around
Heptagonal_tiling
Shape with seven sides
regular heptagon. Apart from the heptagonal prism and heptagonal antiprism, no convex polyhedron made entirely out of regular polygons contains a heptagon as
Heptagon
Regular tiling of the hyperbolic plane
geometry, the order-4 heptagonal tiling is a regular tiling of the hyperbolic plane. It has Schläfli symbol of {7,4}. This tiling represents a hyperbolic
Order-4_heptagonal_tiling
Euclidean 3-space) 1 p + 1 q = 1 2 : Euclidean plane tiling 1 p + 1 q < 1 2 : Hyperbolic plane tiling {\displaystyle {\begin{aligned}&{\frac {1}{p}}+{\frac
List_of_regular_polytopes
Concept in geometry
arrangement: the order-7 heptagrammic tiling, {7/2,7}, and heptagrammic-order heptagonal tiling, {7,7/2}. This tiling is topologically related as a part
Order-7_triangular_tiling
Geometric tiling
related to Uniform tiling 3-4-7-4. Rhombitrihexagonal tiling Order-3 heptagonal tiling Tilings of regular polygons List of uniform tilings Kagome lattice
Rhombitriheptagonal_tiling
Semiregular tiling of the hyperbolic plane
In geometry, the truncated heptagonal tiling is a semiregular tiling of the hyperbolic plane. There are one triangle and two tetradecagons on each vertex
Truncated_heptagonal_tiling
Compact Riemann surface of genus 3
56 × 3 = 168 The covering tilings on the hyperbolic plane are the order-3 heptagonal tiling and the order-7 triangular tiling. The automorphism group can
Klein_quartic
Prism with a 7-sided base
In geometry, the heptagonal prism is a prism with heptagonal base. This polyhedron has 9 faces (2 bases and 7 sides), 21 edges, and 14 vertices. The area
Heptagonal_prism
Tiling of the hyperbolic plane
order-7 heptagrammic tiling is a tiling of the hyperbolic plane by overlapping heptagrams. This tiling is a regular star-tiling, and has Schläfli symbol
Order-7_heptagrammic_tiling
Symmetric subdivision in hyperbolic geometry
around each vertex. For example, 7.7.7 represents the heptagonal tiling which has 3 heptagons around each vertex. It is also regular since all the polygons
Uniform tilings in hyperbolic plane
Uniform_tilings_in_hyperbolic_plane
Polyhedron with 2 faces
called bihedra, flat polyhedra, or doubly covered polygons. As a spherical tiling, a dihedron can exist as nondegenerate form, with two n-sided faces covering
Dihedron
Semiregular tiling of the hyperbolic plane
tiling is a semiregular tiling of the hyperbolic plane, representing a rectified Order-3 heptagonal tiling. There are two triangles and two heptagons
Triheptagonal_tiling
Semiregular tiling of the hyperbolic plane
geometry, the order-3 snub heptagonal tiling is a semiregular tiling of the hyperbolic plane. There are four triangles and one heptagon on each vertex. It has
Snub_triheptagonal_tiling
Semiregular tiling of the hyperbolic plane
triangular tiling, sometimes called the hyperbolic soccerball, is a semiregular tiling of the hyperbolic plane. There are two hexagons and one heptagon on each
Truncated order-7 triangular tiling
Truncated_order-7_triangular_tiling
Uniform tiling of the hyperbolic plane
heptagonal tiling is a uniform tiling of the hyperbolic plane. It has Schläfli symbol of t{7,4}. There are two uniform constructions of this tiling,
Truncated order-4 heptagonal tiling
Truncated_order-4_heptagonal_tiling
In geometry, the heptagrammic-order heptagonal tiling is a regular star-tiling of the hyperbolic plane. It has Schläfli symbol of {7,7/2}. The vertex figure
Heptagrammic-order heptagonal tiling
Heptagrammic-order_heptagonal_tiling
Regular pattern for geometric tiling
truncated order-7 heptagonal tiling is a uniform tiling of the hyperbolic plane. It has Schläfli symbol of t0,1{7,7}, constructed from one heptagons and two tetrakaidecagons
Truncated order-7 heptagonal tiling
Truncated_order-7_heptagonal_tiling
Covering by shapes without overlaps or gaps
wallpaper groups. A tiling that lacks a repeating pattern is called "non-periodic". An aperiodic tiling uses a small set of tile shapes that cannot form
Tessellation
Semiregular tiling of the hyperbolic plane
In geometry, the truncated triheptagonal tiling is a semiregular tiling of the hyperbolic plane. There is one square, one hexagon, and one tetradecagon
Truncated triheptagonal tiling
Truncated_triheptagonal_tiling
7,3}, with three order-4 heptagonal tilings meeting at each edge. The vertex figure of this honeycomb is a heptagonal tiling, {7,3}. In the geometry of
Order-7-3 triangular honeycomb
Order-7-3_triangular_honeycomb
Semiregular tiling of the hyperbolic plane
has media related to Uniform dual tiling V 4-6-14. In geometry, the 3-7 kisrhombille tiling is a semiregular dual tiling of the hyperbolic plane. It is constructed
3-7_kisrhombille
Automorphism group of the Klein quartic
constant negative curvature and then tiled with regular (hyperbolic) heptagons, as a quotient of the order-3 heptagonal tiling, with the symmetries of the surface
PSL(2,7)
the order-3-6 heptagonal honeycomb a regular space-filling tessellation (or honeycomb). Each infinite cell consists of a heptagonal tiling whose vertices
Order-3-6 heptagonal honeycomb
Order-3-6_heptagonal_honeycomb
Polyhedron with two kinds of faces
the triheptagonal tiling, vertex figure (3.7)2 - a quasiregular tiling based on the order-7 triangular tiling and heptagonal tiling. Coxeter, H.S.M. et
Quasiregular_polyhedron
tiling Heptagrammic-order heptagonal tiling Order-9 enneagrammic tiling[citation needed] Enneagrammic-order enneagonal tiling[citation needed] convex regular
List_of_mathematical_shapes
Theorem in algebraic geometry
obtain an orientation-preserving tiling polygon. A Hurwitz surface is obtained by 'closing up' a part of this infinite tiling of the hyperbolic plane to a
Hurwitz's automorphisms theorem
Hurwitz's_automorphisms_theorem
sphere. The Schläfli symbol of the order-4-3 heptagonal honeycomb is {7,4,3}, with three order-4 heptagonal tilings meeting at each edge. The vertex figure
Order-4-3 pentagonal honeycomb
Order-4-3_pentagonal_honeycomb
Polyhedron with regular congruent polygons as faces
extends when hyperbolic tilings are themselves used as facets of noncompact hyperbolic tessellations, as in the heptagonal tiling honeycomb {7,3,3}; they
Regular_polyhedron
Regular space-filling tessellation with Schläfli symbol (7,3,7)
beyond the ideal boundary) with seven heptagonal tilings existing around each edge and with an order-7 triangular tiling vertex figure. It a part of a sequence
Order-3-7 heptagonal honeycomb
Order-3-7_heptagonal_honeycomb
the order-3-5 heptagonal honeycomb a regular space-filling tessellation (or honeycomb). Each infinite cell consists of a heptagonal tiling whose vertices
Order-3-5 heptagonal honeycomb
Order-3-5_heptagonal_honeycomb
Tessellation Uniform tiling Convex uniform honeycombs List of k-uniform tilings List of Euclidean uniform tilings Uniform tilings in hyperbolic plane Weisstein
List_of_tessellations
Operation in Euclidean geometry
of any regular self-dual polyhedron or tiling will result in another regular polyhedron or tiling with a tiling order of 4, for example the tetrahedron
Rectification_(geometry)
Geometric operation applied to a polyhedron
honeycomb is the snub hexagonal tiling honeycomb, as s{3,6,3} and , which can also be constructed as an alternated hexagonal tiling honeycomb, h{6,3,3}, . It
Snub_(geometry)
order-5-3 heptagonal honeycomb or 7,5,3 honeycomb a regular space-filling tessellation (or honeycomb). Each infinite cell consists of an order-5 heptagonal tiling
Order-5-3_square_honeycomb
this triangle for fundamental domain; the associated tiling is the order-3 bisected heptagonal tiling. The (2,3,7) triangle group is defined as the index
(2,3,7)_triangle_group
order-3-4 heptagonal honeycomb or 7,3,4 honeycomb a regular space-filling tessellation (or honeycomb). Each infinite cell consists of a heptagonal tiling whose
Order-3-4 heptagonal honeycomb
Order-3-4_heptagonal_honeycomb
Natural number
Kevin. "Shield - a 3.7.42 tiling". Imperfect Congruence. Retrieved 2023-01-09. 3.7.42 as a unit facet in an irregular tiling. Poonen, Bjorn; Rubinstein
7
Semiregular tiling of the plane
In geometry, the snub square tiling is a semiregular tiling of the Euclidean plane. There are three triangles and two squares on each vertex. Its Schläfli
Snub_square_tiling
Construction in group theory
cases are also realized as the geometries of polyhedra (equivalently, tilings of Riemann surfaces), respectively: the compound of five tetrahedra inside
Projective_linear_group
ideal boundary) with four order-5 square tilings existing around each edge and with an order-4 pentagonal tiling vertex figure. It a part of a sequence
Order-5-4_square_honeycomb
Upper-half plane model of hyperbolic non-Euclidean geometry
Stellated regular heptagonal tiling of the model
Poincaré_half-plane_model
Uniform tiling of the hyperbolic plane
In geometry, the truncated order-7 square tiling is a uniform tiling of the hyperbolic plane. It has Schläfli symbol of t0,1{4,7}. John H. Conway, Heidi
Truncated order-7 square tiling
Truncated_order-7_square_tiling
uniform tilings Uniform tilings in hyperbolic plane Archimedean tiling Square tiling Triangular tiling Hexagonal tiling Truncated square tiling Snub square
List of polygons, polyhedra and polytopes
List_of_polygons,_polyhedra_and_polytopes
Shape with three equal sides
tiles the Euclidean plane with six triangles meeting at a vertex; the dual of this tessellation is the hexagonal tiling. Truncated hexagonal tiling,
Equilateral_triangle
heptaheptagonal tiling is a uniform tiling of the hyperbolic plane. It has Schläfli symbol of sr{7,7}, constructed from two regular heptagons and three equilateral
Snub_heptaheptagonal_tiling
Polyhedron with eight triangular faces
resulting in three pentagonal and five triangular faces. Heptagonal pyramid: One face is a heptagon (usually regular), and the remaining seven faces are triangles
Octahedron
Star polygon with 7 sides
(grammē) meaning a line. In general, a heptagram is any self-intersecting heptagon (7-sided polygon). There are two regular heptagrams, labeled as {7/2} and
Heptagram
Convex polygon which can tile the plane by itself
Laves tilings are unique except for the square tiling (1 degree of freedom), barn pentagonal tiling (1 degree of freedom), and hexagonal tiling (2 degrees
Planigon
Natural number
and angle trisector. The lowest number of squares needed for a perfect tiling of a rectangle is 9. Nine is a number that appears often in Indian culture
9
number that is the sum of 9 positive 5th powers 1071 = heptagonal number 1072 = centered heptagonal number 1073 = number that is the sum of 12 positive 5th
1000_(number)
Three-dimensional solid
Dodecagonal prism ... Apeirogonal prism Polyhedron image ... Spherical tiling image Plane tiling image Vertex config. 2.4.4 3.4.4 4.4.4 5.4.4 6.4.4 7.4.4 8.4.4
Cylinder
Solid with 2 parallel n-gonal bases connected by n parallelograms
zero. The topological polyhedral net can be cut from two rows of a square tiling (with vertex configuration 4.4.4.4): a band of n squares, each attached
Prism_(geometry)
Natural number
June 1978 to March 1979. Full name is Carlos Cadona. 6028 – centered heptagonal number 6037 – super-prime, prime of the form 2p-1 6042 – 6042 Cheshirecat
6000_(number)
Digon/Bigon - 2 sides Triangle – 3 sides Acute triangle Equilateral triangle Heptagonal triangle Isosceles triangle Golden Triangle Obtuse triangle Rational triangle
List of two-dimensional geometric shapes
List_of_two-dimensional_geometric_shapes
Spherical polyhedron composed of lunes
must have at least three sides. When considering polyhedra as a spherical tiling, this restriction may be relaxed, since digons (2-gons) can be represented
Hosohedron
Numbers obtained by adding the two previous ones
are Fn+1 ways to do this (equivalently, it's also the number of domino tilings of the 2 × n {\displaystyle 2\times n} rectangle). For example, there are
Fibonacci_sequence
Varied tincture or fur in heraldry
heraldry, vair is usually presented as rows of alternating irregular heptagonal shapes conventionally known as panes or "vair bells". The panes of one
Vair
Polyhedron made of congruent kites arranged radially
... Apeirogonal trapezohedron Polyhedron image ... Spherical tiling image Plane tiling image Face configuration V2.3.3.3 V3.3.3.3 V4.3.3.3 V5.3.3.3 V6
Trapezohedron
Prism with a 5-sided base
Dodecagonal prism ... Apeirogonal prism Polyhedron image ... Spherical tiling image Plane tiling image Vertex config. 2.4.4 3.4.4 4.4.4 5.4.4 6.4.4 7.4.4 8.4.4
Pentagonal_prism
Natural number
prime, Chen prime, Eisenstein prime with no imaginary part, centered heptagonal number ISBN Group Identifier for books published in Croatia 954 = 2 ×
900_(number)
Antiprism with a five-sided base
antiprism Hexagonal antiprism Heptagonal antiprism ... Apeirogonal antiprism Polyhedron image ... Spherical tiling image Plane tiling image Vertex config. 2
Pentagonal_antiprism
Regular polygonal tiles with paths
268–281, doi:10.1016/j.cag.2007.10.001. Smith, Cyril Stanley (1987), "The tiling patterns of Sebastian Truchet and the topology of structural hierarchy"
Serpentiles
12-sided box
Dodecagonal prism ... Apeirogonal prism Polyhedron image ... Spherical tiling image Plane tiling image Vertex config. 2.4.4 3.4.4 4.4.4 5.4.4 6.4.4 7.4.4 8.4.4
Dodecagonal_prism
Polyhedron with 9 faces
faces around a regular octagonal base. Heptagonal prism: a prismatic uniform polyhedron with two regular heptagon faces and seven square faces. Elongated
Enneahedron
Prism with an 8-sided base
joining two regular octagon caps. The octagonal prism can also be seen as a tiling on a sphere: In optics, octagonal prisms are used to generate flicker-free
Octagonal_prism
Geometric pattern characteristic of Muslim art
coincide with the underlying construction lines of the tiling. The visible patterns and the underlying tiling represent a bridge linking the invisible to the
Islamic_geometric_patterns
Antiprism with 6-sided caps
antiprism Hexagonal antiprism Heptagonal antiprism ... Apeirogonal antiprism Polyhedron image ... Spherical tiling image Plane tiling image Vertex config. 2
Hexagonal_antiprism
Gossard perspector Hadwiger–Finsler inequality Heilbronn triangle problem Heptagonal triangle Heronian triangle Heron's formula Hofstadter points Hyperbolic
List_of_triangle_topics
Polyhedron with parallel bases connected by triangles
X". Harmonices Mundi (in Latin). p. 49. See also illustration A, of a heptagonal antiprism. Schreiber, Peter; Fischer, Gisela; Sternath, Maria Luise (July
Antiprism
Solid with 10 faces
antiprism. The square antiprism is first in a series of snub polyhedra and tilings with vertex figure 3.3.4.3.n. If a {\displaystyle a} denotes the side length
Square_antiprism
Natural number, composite number
polygons that can fill a plane-vertex tiling, where five polygons tile the plane uniformly, and nine others only tile the plane alongside irregular polygons
14_(number)
Natural number
× 33 × 5. It is a largely composite number, an untouchable number, a heptagonal number, and a decagonal number. It is the sum of a pair of twin primes
500_(number)
Ottoman mausoleum
the name of the tomb suggesting that they are green. In Bulgaria, the heptagonal türbes of dervish saints such as Kıdlemi Baba, Ak Yazılı Baba, Demir Baba
Türbe
Municipality in Valencian Community, Spain
created by an outer heptagon that involves the interior and circular floor. Above the interior zone is a dome with Arabic tiles in blue, characteristic
Carlet
Solid made by joining an n- and 2n-gon with triangles and squares
Rhombohedron Cuboctahedron Rhombicuboctahedron Rhombicosidodecahedron Rhombitrihexagonal tiling Rhombitriheptagonal tiling Rhombitrioctagonal tiling
Cupola_(geometry)
Puzzle published in 1921 by Percy MacMahon
) {\displaystyle {\frac {n}{6}}\cdot (n+1)\cdot (n^{4}-n^{3}+n^{2}+2)} Heptagon: n 7 ⋅ ( n 6 + 6 ) {\displaystyle {\frac {n}{7}}\cdot (n^{6}+6)} For example
MacMahon_Squares
Plane figure bounded by line segments
Polygon triangulation Precision polygon Spirolateral Synthetic geometry Tiling Tiling puzzle Coxeter, H.S.M.; Regular Polytopes, Methuen and Co., 1948 (3rd
Polygon
Coxeter); The uniform tilings (infinite polyhedra) 11 Euclidean convex uniform tilings; 28 Euclidean nonconvex or apeirogonal uniform tilings; Infinite number
List_of_uniform_polyhedra
Polyhedral number representing a tetrahedron
built from Ten spheres are used as a unit, it can be shown that a space tiling with such units can achieve a densest sphere packing as long as n ≤ 4.[dubious
Tetrahedral_number
Number that represents a hexagon with a dot in the center
numbers Centered pentagonal numbers Centered hexagonal numbers Centered heptagonal numbers Centered octagonal numbers Centered nonagonal numbers Centered
Centered_hexagonal_number
Historic Reform Jewish synagogue and arts center, in Cleveland, Ohio, US
styles. Built from Indiana limestone and marble, the heptagonal sanctuary is topped by a yellow-tiled 90-foot (27 m) dome, with two smaller domes flanking
Maltz_Performing_Arts_Center
Curved triangle with constant width
"Chapter 18: Curves of Constant Width", Knots and Borromean Rings, Rep-Tiles, and Eight Queens, The New Martin Gardner Mathematical Library, vol. 4,
Reuleaux_triangle
Pictorial representation of symmetry
representing a Coxeter group or sometimes a uniform polytope or uniform tiling constructed from the group. A class of closely related objects is the Dynkin
Coxeter–Dynkin_diagram
Polygon with equally angled vertices
heptagons, ⟨7⟩, ⟨7/2⟩, and ⟨7/3⟩ have 128 4/7°, 77 1/7° and 25 5/7° internal angles respectively. 128.57° internal angles of an equiangular heptagon,
Equiangular_polygon
Paper model
2023. Retrieved October 26, 2012. McIntosh, Harold V. (March 11, 2000). "Heptagonal Flexagons". Cinvestav.mx. Universidad Autónoma de Puebla. Archived from
Flexagon
Recursive integer sequence
..., 2n} in which every block is of size 2. Cn is the number of ways to tile a stairstep shape of height n with n rectangles. Cutting across the anti-diagonal
Catalan_number
Two special graphs in graph theory
represented as the Klein quartic), where it forms the Klein map with 24 heptagonal faces, Schläfli symbol {7,3}8. According to the Foster census, the Klein
Klein_graphs
Relation between sides of a right triangle
{1}{q}}={\frac {1}{r}}} where the denominators are squares and also for a heptagonal triangle whose sides p, q, r are square numbers. One of the consequences
Pythagorean_theorem
Theorem relating the number of edges, vertices and faces of a polyhedron
states that, for given numbers of triangles, quadrilaterals, pentagons, heptagons, and other polygons other than hexagons, there exists a convex polyhedron
Eberhard's_theorem
Restored castle in Morlanne in the Pyrénées-Atlantiques département of France
furniture to the département of Pyrénées-Atlantiques. The castle is a heptagonal building with unequal angles and sides. The enceinte is constructed of
Château_de_Morlanne
Partition of a simple polygon into triangles
polygon. Polygon triangle covering, in which the triangles may overlap. Tiling by polygons, where the goal is to cover the entire plane with polygons of
Polygon_triangulation
Church in Stoke d'Abernon, England
sounding board, which has elaborate wrought-iron supports. The pulpit is heptagonal and made of walnut; it stands on a central column, and is supported by
St Mary's Church, Stoke d'Abernon
St_Mary's_Church,_Stoke_d'Abernon
Church near Fairfield, Kent
both the nave and the chapel. Furnishings include a 15th–16th century heptagonal font constructed with Kentish ragstone. A small altar table in the chancel
Church of St Thomas à Becket, Fairfield
Church_of_St_Thomas_à_Becket,_Fairfield
Cathedral and former mosque in Córdoba, Spain
treasury). The mihrab consists of a horseshoe arch leading to a small heptagonal chamber covered by a shell-shaped cupola above a ring of polylobed blind
Mosque–Cathedral_of_Córdoba
Type of composite integer
https://mathworld.wolfram.com/SmithNumber.html Gardner, Martin (1988). Penrose Tiles to Trapdoor Ciphers. pp. 299–300. Hoffman, Paul (1998). The Man Who Loved
Smith_number
the formation is in a non-equilibrium state. Truncated order-7 triangular tiling Rode, A.V.; Hyde, S.T.; Gamaly, E.G.; Elliman, R.G.; McKenzie, D.R.; Bulcock
Carbon_nanofoam
Algebraic variety
interpreted as a surface with three handles tiled by 24 heptagons, with a cusp at the center of each face. These tilings can be understood via dessins d'enfants
Modular_curve
Extending the elements of a polytope to form a new figure
digons are not considered), and n – 3/2 stellations if n is odd. Like the heptagon, the octagon also has two octagrammic stellations, one, {8/3} being a star
Stellation
3D symmetry group
first yielding the Klein quartic, whose associated geometry has a tiling by 24 heptagons (with a cusp at the center of each). Similar geometries occur for
Icosahedral_symmetry
HEPTAGONAL TILING
HEPTAGONAL TILING
Surname or Lastname
English and Irish
English and Irish : unexplained; most probably a habitational name from a lost or unidentified place somewhere in South Wales or southern England. This name was established in County Meath, Ireland, soon after the Anglo-Norman invasion of the 12th century.Dutch : unexplained.Probably a respelling of German Tiling, a patronymic form of Thiel.
HEPTAGONAL TILING
HEPTAGONAL TILING
Boy/Male
Tamil
Touch, Gold
Boy/Male
English
Form of Mervin.
Male
Greek
(á¼™Ïμῆς) Greek name HERMÊS means "of the earth." In mythology, this is the name of a son of Zeus and Maia. His Roman name is Mercury.
Boy/Male
Tamil
Jitamitra | ஜிதாமிதà¯à®°
Vanquisher of foes
Boy/Male
Greek
Virile; masculine. St. Arsenius the Great tutored Roman emperor Theodosius' sons....
Girl/Female
German
Little and Womanly; Female Version of Charles
Boy/Male
Muslim
Boy/Male
Indian, Sanskrit
The Cause for Begetting Children
Girl/Female
Tamil
Pranaya | பà¯à®°à®¨à®¾à®¯à®¾
Leader
Girl/Female
Hindu
Born with blessings of Lord Shiva
HEPTAGONAL TILING
HEPTAGONAL TILING
HEPTAGONAL TILING
HEPTAGONAL TILING
HEPTAGONAL TILING
n.
The second stomach of ruminants, in which folds of the mucous membrane form hexagonal cells; -- also called the honeycomb stomach.
n.
The pentagonal dodecahedron, a common form of pyrite.
n.
A fluoride of the cerium metals occurring in hexagonal crystals of a pale yellow color. Cf. Fluocerite.
n.
Pure silica, like quartz, but crystallizing in hexagonal tables. It is found in trachyte and similar rocks.
n.
A plane figure consisting of seven sides and having seven angles.
a.
Developed alike in the directions of the several lateral axes; -- said of crystals of both the tetragonal and hexagonal systems.
a.
Having seven angles or sides.
a.
Consisting of two hexagonal parts united; thus, a dihexagonal pyramid is composed of two hexagonal pyramids placed base to base.
n.
A variety of mimetite or arseniate of lead in hexagonal prisms of a fine orange yellow.
n.
A mineral occurring in pale yellow or brownish hexagonal crystals. It is an arseniate of lead.
a.
Pentagonal.
n.
A mass of hexagonal waxen cells, formed by bees, and used by them to hold their honey and their eggs.
a.
Having six sides and six angles; six-sided.
n.
Native cadmium sulphide, a mineral occurring in yellow hexagonal crystals, also as an earthy incrustation.
adv.
In an hexagonal manner.
n.
A figure which has seven angles; a heptagon.
a.
Having six angles; hexagonal.
a.
Heptagonal.
a.
Having five corners or angles.