Buddhism is a religion and philosophy based on the teachings of Siddhartha Gautama, who is known as the Buddha. Buddhist disciplines include ZEN, an ancient school of Mahayana Buddhism that emphasizes meditation and intuition; Arhat, a term used to refer to a perfected person who has attained nirvana; Pali, a language used in many Buddhist scriptures; STUPA, a mound-like structure used as a place of meditation and worship; and Lamas, Tibetan Buddhist spiritual leaders.