One of the most distinctive Thai customs is the wai. Used in greetings, leave-taking, or as an acknowledgement, it comes in many forms, reflecting the relative status of those involved. Generally the salutation involves a prayer-like gesture with the hands, similar to the Añjali Mudrā of the Indian subcontinent, and it also may include a slight bow of the head. This salutation is often accompanied by a serene smile symbolizing a welcoming disposition and a pleasant attitude. Thailand is often referred to as the "land of smiles" in tourist brochures.