moonbow
I am sorry for the lack of response regarding the freemasons and the Grand Etteilla I have and the symbols/references attached to it. I just did not have time to organize a complete answer. However I can refer you to this link from By Christine Payne-Towler
February, 2007 (I agree with a lot of what she is saying and learned about those info from my own freemason family). It is a great reference source:
http://www.tarotarkletters.com/2007/02/masonic_martini.html
And to what the paragraph says:
{In Etteilla's case, it is easy enough to note the Masonry-inflected titles and the planetary references on the faces of Etteilla's pip cards, and several commentators have done so. What is harder is to connect the dots and comprehend the meaning of these details, the references they are making, and the significance of those references in the larger milieu of his times. For example, isn't it clearer now why the Hermit card would be given the titles "Betrayal" and "Falsehood", with divinatory text including such admonitions as "a trap is being laid for you" and "you triumph over a slanderous denunciation"? Knowing more of Etteilla's history helps us to see why he made the end-notes of his Tower card say "Poverty" and "Prison", still too often the choices available to a magus in his time. Realizing that he moved in a Lodge context helps to explain the Templar logo on t he crypt of his Death card, as well as the arrangements of nails at the bottom the numbered cards in the Wands suit. The Planets on his Coin cards, as well as the references to Alchemy on both pips and Trumps, cement the obvious conclusion that Etteilla was straddling the underground and above-ground markets while he taught occultist Tarot usage to the masses. }
For your information, the nails are referring to the nails in the passion of Christ who was said to be a 33 degree freemasons. I have an old cross of 1700 from the spanish era that has below the casted Christ the skeleton head with the crossed bones. It is a typical freemason symbol of high order!
The geometric figures formed on the cards are part of an alphabet and for example on one of those there is the letter (symbol) TAU. So it is to address the 'nails' point i was making a while back.