An eleven-sided polygon.[From Greek hendeca- (eleven), from hen, neuter of heis (one) + deka (ten) + -gon (angled), from gonia (angle).]
Another name for hendecagon is undecagon. A solid having eleven faces is called a hendecahedron or an undecahedron.
The Canadian dollar coin, nicknamed Loonie, is a hendecagon: http://mint.ca/en/catalogue/3dview/loon.htm
And a hendecagon surrounds the portrait on the US Susan B. Anthony dollar coin: http://usmint.gov/dispPicture.cfm?pic=SBAnthony
"This is an 11-sided polygon, which may also be called a hendecagon."
Thomas H. Sidebotham; The A to Z of Mathematics: A Basic Guide; Wiley-Interscience; 2002."The setting is decadent forests inhabited by 'truncated undecagon figures', fragments of selves."
Suzanne Nalbantian; Anais Nin: Literary Perspectives; Palgrave Macmillan; 1997.
This week's theme: words related to the number eleven.
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