Chapter I
What it means
The vajra is a short sceptre with prongs curving together at each end around a central ball. Its name means “thunderbolt” and “diamond”: the power of lightning and the hardness of a gem that cuts everything but cannot itself be cut.
In Buddhism it stands for the awakened mind, which nothing can break, and for the compassionate action that springs from it. In ritual it is paired with a bell, the sign of wisdom; together they stand for the union of method and wisdom that leads to awakening.
Chapter II
Where it comes from
In the Rig Veda, the oldest Hindu scripture, the vajra is the weapon with which the god Indra slew the serpent Vritra and released the waters. Buddhist art first showed it in the hand of Vajrapani, a protector of the Buddha.
As tantric Buddhism developed in India, the vajra became its central emblem and gave its name to the whole tradition, Vajrayana, which spread to Tibet from the 8th century.
Chapter III
Where you see it today
Vajras and bells are used daily in Tibetan, Bhutanese and Mongolian monasteries. A great vajra stands at the top of the steps to the Swayambhunath stupa in Kathmandu. The double, crossed vajra is used as a seal and appears on the emblem of Bhutan.