What is the term used for marking a check unusable after making a mistake?

The term "void" is used when marking a check unusable after a mistake is made. When a check is voided, it indicates that it will not be honored or processed by the bank. The process typically involves writing "VOID" clearly across the front of the check, which prevents any further attempts to cash or deposit it. This practice ensures that no financial discrepancies arise from the mistaken check.

In contrast, terms like "cancel," "invalid," and "delete" do not accurately convey the specific banking context of notifying that the check cannot be used. "Cancel" could imply stopping a transaction but does not specifically apply to checks. "Invalid" might describe a check that cannot be processed for other reasons, not necessarily due to a mistake made by the issuer, while "delete" is generally not used in the context of physical checks, as it relates more to digital or electronic transactions. Thus, "void" is the precise term used in this scenario.