Heptagram
A heptagram, septagram, septegram or septogram is a seven-point star drawn with seven straight strokes.
| Regular heptagram (7/2) | |
|---|---|
A regular heptagram | |
| Type | Regular star polygon |
| Edges and vertices | 7 |
| Schläfli symbol | {7/2} |
| Coxeter–Dynkin diagrams | |
| Symmetry group | Dihedral (D7) |
| Internal angle (degrees) | ≈77.143° |
| Properties | star, cyclic, equilateral, isogonal, isotoxal |
| Dual polygon | self |
| Regular heptagram (7/3) | |
|---|---|
A regular heptagram | |
| Type | Regular star polygon |
| Edges and vertices | 7 |
| Schläfli symbol | {7/3} |
| Coxeter–Dynkin diagrams | |
| Symmetry group | Dihedral (D7) |
| Internal angle (degrees) | ≈25.714° |
| Properties | star, cyclic, equilateral, isogonal, isotoxal |
| Dual polygon | self |
| Star polygons |
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The name heptagram combines a numeral prefix, hepta-, with the Greek suffix -gram. The -gram suffix derives from γραμμῆ (grammē) meaning a line.
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