The mystery of the mind, the omniscience, the pure awareness of all the Buddhas,
Indicated by a symbol of eternal strength and constancy,
The vajra heart of knowledge and emptiness is like the sky — How wonderful to see the intrinsic face of reality!

~ translation of a Tibetan verse

vajra (Sanskrit, 'thunderbolt' and 'diamond') / dorje (རྡོ་རྗེ། Tibetan, 'noble stone': Do='stone' and rje='noble' or 'prince') / kongo (金剛 Japanese):


— a ritual tool symbolizing the indestructibility of a dimond and the irresistable force of a thunderbolt. It also signifies enlightenment or the absolute reality of shunyata, emptiness. In Tibetan rituals the vajra is held in the right hand to represent firmness and power of the spirit as well as the male principle, upaya, action or means. Meanwhile, a bell in the left hand symbolizes the female principle, prajna, wisdom.

— two dorjes connected in the form of a cross make a double dorje or vishvavajra, representing the foundation of the physical world and associated with certain tantric deities.

— a common male name in Tibet and Bhutan.