# What does the SIGMA (Σ) sign mean?

What does the Σ sign mean in electronics?

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Could you provide an example from where this is used? –  Wilhelmsen Dec 6 '12 at 12:31
Context! If it's a greek datasheet it's the capital letter "S" –  Federico Russo Feb 6 '13 at 10:10

Sigma = summation of signals.... It can also mean to subtract signals if the sign in negative for 1 of the signals http://www.freepatentsonline.com/6920182-0-large.jpg

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