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http://en.wikipedia.org/wiki/Squircle

ah!

I don't think I know anyone who wouldn't just call them rounded corners. Except maybe blogs trying to coin a new term to make them seem interesting again.

"Rounded corners" suggests garden-variety border-radius usage.

"Squircle, the superellipse with n = 4, a = b = 1"

Wasn't a squircle the name for the control pad on Zune?

I thought Nokia 'owned' the squircle http://interuserface.net/2011/06/own-a-shape/