Sigma     ( noun)
1 - the 18th letter of the greek alphabet, a consonant transliterated as S
2 - maths, a symbol that indicates summation of the numbers or quantities indicated.

I.T.       (abbrev.)
1 - two letter acronym for Information Technology,  the art and science of using technology to provide and share information, either locally or globally. Normally involves computers, software, peripheral devices, and often a generous quantity of blasphemous profanities.

Blasphemous profanities     ( long words )
1. - a very convoluted way of saying bad language, which of course is more colloquially understood as ****ing swearing. Most computer users will have suffered from this affliction at some point or another.

Sigma (IT) Ltd    ( a company)
1 - providers of IT training and IT business solutions to users of computers.    
2 - showing users how to get the best from all the computers, software and peripheral devices without having to resort to large quantities of ****ing blasphemous profanities.