OM: Found in Hinduism, Buddhism, and Jainism. It is a sacred spiritual incantation made before and during the recitation of spiritual texts, ceremonies of rites of passage, and during meditative and spiritual activities. They Om is a Sanskrit symbol and visual representation of the totality of sound, existence, and consciousness.
Vajra Found in Hinduism, Buddhism, and Jainism. Vajra translates to both 'Thunderbolt' and 'diamond', a ritual object to symbolize both the properties of a diamond (indestructibility) and a thunderbolt (irresistible force). In Buddhism, the vajra is the symbol of Vajrayana, one of the three major branches of Buddhism. Vajrayana is translated as 'Thunderbolt Way' or 'Diamond Way' and can imply the thunderbolt experience of Buddhist enlightenment or bodhi. It also implies indestructibility, just as diamonds are harder than other gemstones. It was the weapon of the deity Indra to defeat the demon Vritra.