Definition - What does Vajra mean?
Like many Sanskrit words, vajra has more than one possible meaning in English. In this case, it can be translated as both “thunderbolt” and “diamond." This dual definition can be traced back to its origins as a ritual object that had both the indestructible nature of a diamond and the irresistible force of a thunderbolt. It is a sort of club that ends in a spherical head and is said to be the weapon of the deity Indra. The vajra is important in Hinduism, Buddhism and Jainism as a symbol of spirituality and spiritual power.
In yoga, vajra is a style that encourages a slower and more meditative approach to yogic practice.
Yogapedia explains Vajra
The term, vajra, is an ancient and deeply powerful one that conveys images of strength, indestructibility and force. The symbolism and spiritual background of the vajra make it an important element in a number of different religions and cultures.
Vajra is also a type of yoga that is slower paced than many other variants. It encourages practitioners to focus on their breathing and to slowly discover the spirituality they are looking for without too many sudden physical exertions. It is a deeply meditative style of yoga that encourages the individual to engage in embodied mindfulness so they may become more deeply rooted in the present moment.