21 card tarot - the world and the letter TH ( gematria meaning a brand or a cross )
It also signifies the universe and in Crowley's version there is an allusio to the table of chemical elements : Copper Venus ( CU 29 ) and Stibnite - antimony ( SB 51 )
Copper and antimony would then show a woman upside down and right way up - just as the constellation does appearing as either a ' W ' or an ' M 'shape
Lead PB poisoning is often found in people who have used Kohl eyemake up because of Galena content and is known as Saturnian poisoning. Saturn rules the tarot card 21 - the world and the cross ( th/ tau )
The egyptian ANKH is similar to the symbol of copper and means ' eternal life'
http://en.wikipedia.org/wiki/Ankh
* where it mentions
the Ankh, symbol of life, thoracic vertebra of a bull (seen in cross section)
the Djed, symbol of stability, base on sacrum of a bull's spine>>

then this may well be the Pleiades as these stars are found on the bull's spine/ back, but this is merely an opinion of these authors.

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notes :
The letter P of phosporous is gematria value of 80 and means mouth / opening. The letter P is seen in the coils of the serpent tails.