A checkmark is a symbol that is used to denote the completion of a task or to mark something as correct. Synonyms for checkmark include tick, check, mark, X, and verification. The tick symbol is commonly used in the United Kingdom while the checkmark is more frequently used in the United States. The term "mark" can also be used to refer to a checkmark or any other symbol used to indicate completion or correctness. An X can be used to indicate that something is incorrect or has not been completed. Verification is a formal term that can be used to describe the act of verifying that something has been completed or is correct.