The Verdic name of the so-called Celtic cross, with a wheel in its center, that signifies the union of the male and female principles. When displayed by Vishnu, this emblem meant the phallic god’s «power to penetrate heaven and earth.» The word was probably related to chakra, the magic circle of men and women alternating in Tantric worship. Kiakra was of the original combinations of cross and circle (wheel or egg) from which sprang forth the so-called Cross of Wotan, ankh of Osiris, and other male-female symbols of divine union. A.G.H.

Source: 56.