File:Gemini alt 18.svg

Summary
From Dictionary of Occult, Hermetic and Alchemical Sigils (GETTINGS 1981)
 * ASTROLOGY 17C (Mss. BM London, S1. 1697. Miscellaneous collection relating to Judicial Astrology, astronomy...)
 * BONATTI 15C (Mss. BM London, Add. 26,768. Indroductorium magistri Guidonis Bonatti in Judiciis Astrologie...)
 * TABLE 17C (Mss. Astrological Table - Reproduced in THOMPSON 1929)
 * THOMPSON 1929 (The Mystery and Romance of Astrology by CJS Thompson)
 * WALTER 1970 (Die Symbole der Chemiker by WW Walter) gives a Greek variant which is also used for lead.