A proofreader's mark is a symbol or short word written in the margin of a document to indicate that a correction has been made. The four most common proofreader's marks are DELE, CARET, STET, and ITAL. DELE stands for 'DELETE, ' indicating that a word or phrase should be removed from the text. CARET is an upward-pointing arrow used to indicate that a letter, word, or phrase should be inserted into the text. STET is Latin for 'let it stand, ' meaning that the text should remain as it is. ITAL is an abbreviation for 'ITALICIZE, ' indicating that a word or phrase should be italicized.