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Sigma notation. mc-TY-sigma-2009-1. Sigma notation is a method used to write out a long sum in a concise way. In this unit we look. at ways of using sigma notation, and establish some useful rules. In order to master the techniques explained here it is vital that you undertake plenty of practice. exercises so that they become second nature.
sigma - the 18th letter of the Greek alphabet. 1  Greek alphabet - the alphabet used by ancient Greeks. 2  alphabetic character, letter of the alphabet, letter - the conventional characters of the alphabet used to represent speech; his grandmother taught him his letters.