| Hendecagram | |
|---|---|
 The four regular hendecagrams | |
| Edges and vertices | 11 |
| Schläfli symbol | {11/2}, {11/3} {11/4}, {11/5} |
| Coxeter–Dynkin diagrams |      ,   ,  |
| Symmetry group | Dih11, order 22 |
| Internal angle (degrees) | ≈114.545° {11/2} ≈81.8182° {11/3} ≈49.0909° {11/4} ≈16.3636° {11/5} |
In geometry, a hendecagram (also endecagram or endekagram) is a star polygon that has eleven vertices.
The name hendecagram combines a Greek numeral prefix, hendeca-, with the Greek suffix -gram. The hendeca- prefix derives from Greek ἕνδεκα (ἕν + δέκα, one + ten) meaning "eleven". The -gram suffix derives from γραμμῆς (grammēs) meaning a line.[1]
- ^ Liddell, Henry George; Scott, Robert (1940), A Greek-English Lexicon: γραμμή, Oxford: Clarendon Press