Note that the syllables are shortened forms, and there are also longer, Japanese mantra that go with the same mudra. As to why there appears to be no correlation between the mudra and mantra and the representative deities is unknown at this time. Also many mantra end with the Sanskrit word "o'ṃ" (om). The meaning of "o'ṃ" is literally "to shout loudly", while the esoteric religious meaning is seen as the sacred name or essence of God and means "I am existence". It is used at the end of the invocation to the god being sacrificed to (anuvakya) as an invitation to and for that God to partake of the sacrifice.