Nelson is a piece of cricket slang terminology and superstition. The name, applied to team or individual scores of 111 or multiples thereof (known as double nelson, triple nelson, etc.) is thought to refer to a wicket.

Longtime cricket historian and scorer, Bill "Bearders" Frindall once referred to it online as "one eye, one arm and one etcetera", implying that Nelson's alleged third lost body part was "something else", however this is equally mythical.

It is thought by the superstitious that bad things happen on that score, although an investigation by the magazine The Cricketer in the 1990s found that wickets are no more likely to fall on Nelson and indeed, the score at which most wickets fall is 0 (a duck). It may be considered unlucky because the number resembles a wicket without bails (a batsman is out if the bails are knocked off their wicket).

The New Zealand cricket team Nelson played first-class cricket from 1874 to 1891. In both their first and last first-class innings they were dismissed for 111.

David Shepherd made popular the longstanding practice of raising a leg or legs from the ground on Nelson in an effort to avoid ill fate. When crowds noticed this, they would cheer his leg-raising.

More Info: en.wikipedia.org