Quadrillion (1,000,000,000,000,000
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An 11 sided figure is called a hendecagon, an undecagon, or a 11-gon.
Pi has no letters. The first 11 decimal places are: 3.14159 26535 8
odecogon
The best name seems to be hendecagon (from the Greek word for "eleven").See http://mathworld.wolfram.com/Hendecagon.html.
11