Wiktionary
n. a mark ((lang und sc=Latinx ✓)) made to indicate agreement, correctness or acknowledgement
WordNet
Wikipedia
A check mark, checkmark or tick is a mark (✓, ✔, etc.) used to indicate the concept "yes" (e.g. "yes; this has been verified", "yes; that is the correct answer", "yes; this has been completed", or "yes; this [item or option] applies to me"). The x mark is also sometimes used for this use (most notably on election ballot papers), but otherwise usually indicates "no", incorrectness, or failure.
As a verb, to check (off) or tick (off), means to add such a mark. Printed forms, printed documents, and computer software (see checkbox), commonly include squares in which to place check marks.
Usage examples of "check mark".
Ivins shifted in her chair, made another check mark on her list, and said, “.
Davey made a check mark in his notebook without looking at it, and handed it back.
One imperial check mark on an order and a whole race can go phuttt!
One Imperial check mark on an order and a whole race can go phuttt!
She made another check mark next to his name and was about to reprimand him further, but the smirk on his face stopped her cold.
Instead, he handed God a clipboard, and He made a huge check mark with a golden marker.
He would feel no differently about cutting my throat than he would about putting down a check mark.