OATH n. 2 definitions
A solemn affirmation, connected with a sacred object, or one regarded as sacred, as the temple, the altar, the blood of Abel, the Bible, the Koran, etc.
OM interj.
later a symbol of the trinity formed by Vishnu, Siva, and Brahma. -- Om mani padme hun, a sacred formula of buddhism (esp. of the Lamaists) translated "O, the Jewel in the Lotus, Amen," and referring to Amitabha, who is commonly represented as standing or sitting within a lotus.