Proofreader's marks are symbols used by editors and proofreaders to indicate changes that need to be made to a document. Carets (^) are used to indicate where a letter, word, or punctuation mark should be inserted. Deles (˟) are used to indicate where a letter, word, or punctuation mark should be deleted. Stets (✓) are used to indicate that a letter, word, or punctuation mark should remain unchanged.