Enneagram (geometry)

In geometry, an enneagram (🟙 U+1F7D9) is a nine-pointed plane figure. It is sometimes called a nonagram, nonangle, or enneagon.

This article is about the geometric polygon. For other uses, see Enneagram (disambiguation).
"Nonagram" redirects here. For the puzzle, see Nonogram.
Enneagram
Enneagrams shown as sequential stellations
Edges and vertices9
Symmetry groupDihedral (D9)
Internal angle (degrees)100° {9/2}
20° {9/4}
Star polygons

The word 'enneagram' combines the numeral prefix ennea- with the Greek suffix -gram. The gram suffix derives from γραμμῆ (grammē) meaning a line.

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