Version of Rosy Cross symbol -- the Hebrew Tetragrammaton divine name on the arms of the cross, and the Pentagrammaton in the inner pentagram. Apparently the emblem of the 19th-century "Ordre Kabbalistique de la Rose-Croix" society, founded in 1888 in Paris by Joséphin Péladan (died 1918) and Stanislas de Guaita (died 1897).
Illustration from 19th-century occultistic/mystical work (reproduced in Oswald Wirth's 1927 Le Tarot des Imagiers du Moyen Age), Vectorization:  Frater5, and originally uploaded to en.wikipedia on 18:03, 3 June 2007.
Vectorization:  Frater5