Heptagram

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Regular heptagram (7/2)
Regular star polygon 7-2.svg
A regular heptagram
TypeRegular star polygon
Edges and vertices7
Schläfli symbol{7/2}
Coxeter diagramCDel node 1.pngCDel 7.pngCDel rat.pngCDel 2x.pngCDel node.png
Symmetry groupDihedral (D7)
Internal angle (degrees)≈77.143°
Dual polygonself
PropertiesStar, cyclic, equilateral, isogonal, isotoxal
Regular heptagram (7/3)
Regular star polygon 7-3.svg
A regular heptagram
TypeRegular star polygon
Edges and vertices7
Schläfli symbol{7/3}
Coxeter diagramCDel node 1.pngCDel 7.pngCDel rat.pngCDel 3x.pngCDel node.png
Symmetry groupDihedral (D7)
Internal angle (degrees)≈25.714°
Dual polygonself
PropertiesStar, cyclic, equilateral, isogonal, isotoxal

A heptagram, septagram, septegram or septogram is a seven-point star drawn with seven straight strokes.

The name heptagram combines a numeral prefix, hepta-, with the Greek suffix -gram. The -gram suffix derives from γραμμῆ (grammē) meaning a line.[1]

Geometry[edit]

In general, a heptagram is any self-intersecting heptagon (7-sided polygon).

There are two regular heptagrams, labeled as {7/2} and {7/3}, with the second number representing the vertex interval step from a regular heptagon, {7/1}.

This is the smallest star polygon that can be drawn in two forms, as irreducible fractions. The two heptagrams are sometimes called the heptagram (for {7/2}) and the great heptagram (for {7/3}).

The previous one, the regular hexagram {6/2}, is a compound of two triangles. The smallest star polygon is the {5/2} pentagram.

The next one is the {8/3} octagram and its related {8/2} star figure (a compound of two squares), followed by the regular enneagram, which also has two forms: {9/2} and {9/4}, as well as one compound of three triangles {9/3}.

Obtuse heptagram.svg
{7/2}
Acute heptagram.svg
{7/3}
Heptagrams.svg
{7}+{7/2}+{7/3}
Heptagrammic prism 7-2.png
7-2 prism
Heptagrammic prism 7-3.png
7-3 prism
6-simplex t0.svg
Complete graph
Antiprism 7-2.png
7-2 antiprism
Antiprism 7-3.png
7-3 antiprism
Antiprism 7-4.png
7-4 antiprism


Uses[edit]

Flags and heraldry[edit]

Law enforcement[edit]

Religious and occult symbolism[edit]

Seal of Babalon and the A∴A∴
  • The heptagram was used in Christianity to symbolize the seven days of creation and became a traditional symbol for warding off evil. The symbol is used in some Christian branches such as Catholicism and Orthodox Christianity.
  • The symbol is also used in Kabbalist Judaism.
  • In Islam, the heptagram is used to represent the first seven verses in the Quran.
  • The heptagram is used in the symbol for Babalon in Thelema.
  • The heptagram is known among neopagans as the Elven Star or Fairy Star. It is treated as a sacred symbol in various modern pagan and witchcraft traditions. Blue Star Wicca also uses the symbol, where it is referred to as a septegram. The second heptagram is a symbol of magical power in some pagan spiritualities.
  • In alchemy, a seven-sided star can refer to the seven planets which were known to early alchemists, and also, the seven alchemical substances: fire, water, air, earth, sulphur, salt and mercury.
  • In Polynesia, the seven-pointed star is used often in imagery, basket making, tattoos, and is considered to be a symbol of Kanaloa, the first Polynesian navigator. [2][3]

In popular culture[edit]

Logo of Maersk
  • The logo of american shoe brand DC Shoes features a 7/3 heptagram in the letter C.
  • The seven-pointed star is used as the logo for the international Danish shipping company A.P. Moller–Maersk Group, sometimes known simply as Maersk.
  • In George R. R. Martin's novel series A Song of Ice and Fire and its TV version Game of Thrones, a seven-pointed star serves as the symbol of the Faith of the Seven.
  • In the manga series MeruPuri, a magical mirror/ portal is in the shape of a heptagram. The symbol is also seen during spellcasting.
  • Finnish rock band HIM used a heptagram on the cover of their eighth studio album Tears on Tape.
  • American heavy metal band Darkest Hour used a heptagram on the cover of their eighth studio album Darkest Hour.
  • English Singer Damon Albarn uses a heptagram as a symbol in his solo performances.
  • The {7/3} heptagram is used by some members of the otherkin subculture as an identifier.
  • The American Progressive Rock Metal Band “Tool” uses an ‘open’ seven pointed symbol for their fan group, The Tool Army. It is ‘open’ to signify an invitation into the collective unconscious.

See also[edit]

References[edit]

  1. ^ γραμμή, Henry George Liddell, Robert Scott, A Greek-English Lexicon, on Perseus
  2. ^ https://www.huna.org
  3. ^ https://www.amazon.com/Children-Rainbow-Religions-Legends-Pre-Christian/dp/0835600025

Bibliography

  • Grünbaum, B. and G.C. Shephard; Tilings and Patterns, New York: W. H. Freeman & Co., (1987), ISBN 0-7167-1193-1.
  • Grünbaum, B.; Polyhedra with Hollow Faces, Proc of NATO-ASI Conference on Polytopes ... etc. (Toronto 1993), ed T. Bisztriczky et al., Kluwer Academic (1994) pp. 43–70.
  • John H. Conway, Heidi Burgiel, Chaim Goodman-Strass, The Symmetries of Things 2008, ISBN 978-1-56881-220-5 (Chapter 26. pp. 404: Regular star-polytopes Dimension 2)

External links[edit]