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a writer’s and a proofreader’s mark: A caret is a symbol that is used to indicate where material is to be inserted in a document.
A proofreading symbol (^) used to indicate where something is to be inserted in a line of printed or written matter.
(Journalism & Publishing) a symbol (⁁) used to indicate the place in written or printed matter at which something is to be inserted
[C17: from Latin, literally: there is missing, from carēre to lack]
a mark (^) made in written or printed matter to show the place where something is to be inserted.
[1700–10; < Latin caret (there) is lacking or wanting]