http://en.wikipedia.org/wiki/Sic

Or basically: it's used to show that text which is spelt incorrectly has been taken from the original source. smile
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Hail Satan!
Damien Mocata
Citizen of the Infernal Empire

Not every cage is made of bars.
"The Humanoid form makes an excellent concentrated protein. " - Davros
"You are a collection of probability fields. " - Me.