Which word is used to mark an error in a sentence taken from another source?

The word used to mark an error in a sentence taken from another source is sic. It is placed in square brackets after the error to indicate that the error is not a mistake on the part of the person quoting the text, but rather a mistake in the original source.

For example:

"The cat sat on the mat, [sic] and then jumped off."

This sentence indicates that the original text actually read "The cat sat on the mat and then jumped off," with the word "sic" indicating that the missing comma is an error in the original text.