Sic

Sic is a Latin word meaning "thus", "so", "as such", or "in such a manner". In writing, it is placed within square brackets and usually italicized – [sic] – to indicate that an incorrect or unusual spelling, phrase, punctuation, and/or other preceding quoted material has been reproduced verbatim from the quoted original and is not a transcription error.

It had a long vowel in Latin (sīc), meaning that it was pronounced like the English word "seek"; however, it is normally anglicised to /'sɪk/ (like the English word "sick").

The word sic may be used either to show that an uncommon or archaic usage is reported faithfully: for instance, quoting the U.S. Constitution:

The House of Representatives shall chuse [sic] their Speaker...

or to highlight an error, sometimes for the purpose of ridicule or irony, as in these examples:

Warehouse has been around for 30 years and has 263 stores, suggesting a large fan base. The chain sums up its appeal thus: “styley [sic], confident, sexy, glamorous, edgy, clean and individual, with it's [sic] finger on the fashion pulse.”

It is also sometimes used for comic effect:

The Daily Mail was the first newspaper [sic] …

It is sometimes erroneously thought to be an acronym from any of a vast number of phrases such as "spelling is correct", "same in copy", "spelling intentionally conserved", "spelling included", "said in context", or "sans intention comique" (French: without comic intent). These "backronyms" are all false etymologies.

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