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I'm confused. The greek letter given in the following line from this page:

(geometry) Curved in two directions, like the letter “S”, or the Greek “ς” (sigma).

looks more like a zeta to me. Can someone clarify?

Um.. zeta is ζ. ς is a sigma (specifically, the final sigma). —Muke Tever 22:21, 13 July 2006 (UTC)