Vajra is a Sanskrit word meaning both thunderbolt and diamond. It is also a weapon which is used as a ritual object to symbolize both the power of indestructible diamond and irresistible force of thunderbolt
It is the symbol of the esoteric doctrine of the Buddha and represents Tantrism. It is called “Dorje” in Tibetan, It also represents a firmness of spirit and spiritual power, being one of the important sacred tools and ritual implement in Vajrayana Buddhism, Hinduism and Tantra where it symbolizes the male principle of creation and represents both method and “Upaya” (means “skillful” ) in religious practice. When made to be worn as a pendant, it reminds the wearer, and the viewer, of the supreme indestructibility of knowledge. In the Tantric traditions of Buddhism, the Vajra also symbolizes for the nature of reality, or sunyata.