Defective stop sign?

• Nine-sided polygon
• Nine-sided shape
• A regular one has internal angles of 140 degrees
• Shape of a Bahai temple
• Shape of every Baha'i temple
• Nine-sider
• Drama introduces Harry: touching figure!
• It has nine angles and nine sides

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

WordNet Word definitions in WordNet
n. a nine-sided polygon