Dear HoneyShot,
Yes, that is a Tarot card!
This card's symbolism shows Aleister Crowley's ideas which is painted by Lady Harris. (Both English). But these tarot decks (which is called Thoth Tarot) show symbolic figures from mostly Egyptian beliefs and sometimes Hindu and even Persian and are hired to describe specificly the relations in Qabalah (which is today known mostly in corelation with Jews. But it's origins is older than Jewish prophets.)
I am Iranian and the "Holy" man showed in the pictures resembles a lot to a ancient Persian "Magi". Or even old Persian Kings like "Cyrus the Great".
I have studied a lot about this card and could not find the meaning of that sign of hand.