Yama: 1) is the first stage of Ashtanga yoga described in the Yoga Sutras of Patanjali. Yama is a collection of moral rules that include such external world relation as: Ahimsa (nonviolence), Satya (truthfulness), Asteya (non-stealing), Brahmacharya (continence, self-control), Aparigraha (absence of avarice).
2) (Sanskrit for “twin”) — God of death and justice in Hinduism. Has Indo-Iranian roots and was initially worshiped as the God of Sun, the twin of Moon. Sun circuits reminded people of cycles of births and deaths. Thus later on Yama became the God of death, gloomy and retributive. Yama also was the first man who showed people the way to the Underworld.