From: Inman, Thomas (1820-1876) Ancient pagan and modern Christian symbolism (1884)
Sri lantra [Yantra] is an ancient Hindoo [Hindu] emblem. The circle represents the world, in which the living exist; the triangle pointing upwards shows the male creator; and the triangle with the apex downwards the female; distinct, yet united. These have a world within themselves, in which the male is uppermost. In the central circle the image to be worshipped is placed. When used, the figure is placed on the ground, with Brahma to the east, and Laksmi to the west. Then a relic of any saint, or image of Buddha, like a modern papal crucifix, is added, and the shrine for worship is complete. It has now been adopted in Christian churches and Freemasons' lodges.