In philosophy and Religion Yantras are geometric shapes that define the workings of various kinds of energies.

Yantra is basically a contrivance, charged with the power of a mantra. It could be a geometric shape as in case of devata yantra or just any instrument as in case of an astra. It is the tool. The nature of Yantra depends on its purpose sought to be served. Each devata is said to have a Yantra, a specific geometric shape that represents the nature of devata and a world model. For temporary purposes and worshipping, it could be drawn on clean floor with turmeric or some other powder, or for installations it could be carved on metal plates. The Yantra is worshipped and charged with corresponding mantra. It is treated like the devata, and is worshipped as the devata. The worship of yantra includes the worship of presiding Devata along with the consort, associate and subordinate Devatas and is an elaborate ritual consisting of propitiation of each of those.