An X mark is either used to indicate the concept of negation, or indicate affirmation. When used to mean "no," its opposite is often considered to be the O mark used in Japan and Korea or the check mark (✓) used in the West. When used to mean "yes," it is often completely interchangeable with a check mark. In Japanese, the X mark (❌) is called "batsu" (ばつ) and can be expressed by someone by crossing their arms.