What has a front and obverse
Eleven-sided, it'll fit in a purse?
Hendecagon it is
And handy for biz.
It's a Loonie you can trade at a bourse.

Merriam-Webster Dictionary: bourse noun
Etymology: Middle French, literally, purse, from Medieval Latin bursa -- more at PURSE
1 : EXCHANGE 5a; specifically : a European stock exchange
2 : a sale of numismatic or philatelic items on tables (as at a convention)

The Canadian dollar coin, nicknamed Loonie, is a hendecagon. per Anu

http://mint.ca/en/catalogue/3dview/loon.htm

Dictionary.com: obverse n.
The side of a coin, medal, or badge that bears the principal stamp or design.