A lockout is a safety procedure that involves the use of locks and tags to prevent the unauthorized operation or energization of equipment. It typically involves placing a physical lock on a switch, valve, or other control device to ensure that it cannot be operated until the lockout is removed. The symbol "🔒⛔️" represents the concept of lockout, with the lock emoji indicating the act of securing equipment and the no-entry sign emoji representing the restriction or prohibition associated with lockout procedures.