Online Encyclopedia of Western Signs and Ideograms Symbols.com

Symbol 40:13

4013

40:13 · Soufre des philosophes, or the wise man's sulphur, a sign used in seventeenth-century chemistry.
    Compare with 3903 in Group 39, the most common sign for sulphur.
    A synonymous sign is 41a74 according to Diderot's Encyclopedia. Wise men's sulphur was also drawn 4062 according to Diderot.