Polygons by the number of sides | Elementary shapes

Nonagon

In geometry, a nonagon (/ˈnɒnəɡɒn/) or enneagon (/ˈɛniəɡɒn/) is a nine-sided polygon or 9-gon. The name nonagon is a prefix hybrid formation, from Latin (nonus, "ninth" + gonon), used equivalently, attested already in the 16th century in French nonogone and in English from the 17th century. The name enneagon comes from Greek enneagonon (εννεα, "nine" + γωνον (from γωνία = "corner")), and is arguably more correct, though less common than "nonagon". (Wikipedia).

Nonagon
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Enneagram (geometry) | Symmetrohedron | Schläfli symbol | Cyclic group | Complete graph | Constructible polygon | Neusis construction | Polygon | Geometry | Regular polygon | 8-simplex | Angle trisection | Orthographic projection | Circumscribed circle | John Horton Conway