Bar Review-a-Thon Question...

Does a chocolate or candy bar have to be rectangular?  While scarfing down a few bars as of late, I've realized that for the most part bars are pretty consistent in their shape.  While not all are perfect rectangles, such as the Baby Ruth or Oh Henry bar, they still have that basic long format.  The only exception is the Ritter Sport bar that's more square.  But then what about Peppermint Paddies, are they bars?  Can a bar be circular or triangular?

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CC