In typesetting:
* Proofreader's mark: This is the most common term for a mark made on a proof to indicate a correction or change.
* Correction mark: Another common term, particularly when the mark is used to indicate an error that needs to be fixed.
* Typographical mark: This term is used when the mark is specifically related to a typographic error.
In other contexts:
* Annotation: This is a more general term used to describe any mark or comment added to a document, including proofing marks.
* Markup: This term is used to describe any mark or comment added to a document, often for the purpose of editing or revision.
Specific terms:
There are also specific terms for certain types of proofing marks, such as:
* Caret: A symbol used to indicate where to insert text.
* Delete mark: A symbol used to indicate text that should be removed.
* Circle: Used to highlight a potential problem, but without specifying what needs to be done.
Ultimately, the best term to use will depend on the specific situation and what you are trying to communicate.