Swastika of four T’s.
Life Symbols as Related to Sex Symbolism: A Brief Study into the Origin and Significance of Certain Symbols Which Have Been Found in All Civilisations, Such as the cross, the circle, the serpent, the triangle, the tree of life, the swastika, and other solar emblems, showing the unity and simplicity of thought underlying their use as religious symbols
Elizabeth E. Goldsmith
London: G.P. Putnam’s Sons, 1924.