Sigma

He did the project solo and called it sigma mode.

To obtain the net mechanical force over the entire object, we must sum the contributions from all the small sections. Mathematically, the summation is indicated by the Greek letter sigma (Σ).

Six Sigma is an optimisation of production method developed by Motorola.

Everybody wants to be a sigma, but nobody wants to be a delta.

Their names, which are expressive of some bodily or mental excellence, all end with the same letter---the letter which is called San by the Dorians, and Sigma by the Ionians.

2011, Paul Rincon, (bbc.co.uk) LHC: Higgs boson 'may have been glimpsed' None of the spikes seen by the experiments is at much more than the "two sigma" level of certainty. A level of "five sigma" is required to claim a discovery, meaning there is less than a one in a million chance the data spike is down to a statistical fluke.