Geometric figure

• Figure of horse appearing in middle of day
• A regular one has internal angles of 140 degrees
• Canon agonises somewhat to reveal figure
• Many-sided figure
• Shape of a Bahai temple
• Nine-sider
• News about Bosnia regularly ignored – go figure

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
"plane figure with nine sides," 1680s, a hybrid from Latin nonus "ninth" (see nones ) + ending from pentagon , etc.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Nonagon \Non"a*gon\, n. [L. nonus ninth + Gr. ? angle.] (Math.) A plane figure or polygon having nine sides and nine angles.

Wiktionary Word definitions in Wiktionary
n. (context geometry English) A polygon with nine sides and nine angles.