Hindoo emblem, called Sri Iantra

[This] "is an ancient Hindoo emblem, called Sri Iantra. 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.

It will be noticed that the male emblem points to the rising sun, and the female triangle points to the setting sun, when the earth seems to receive the god into her couch".

Source: Ancient Pagan and Modern Christian Symbolism by Thomas Inman, New York, 1875, Figure 33, p. 26