The Aquarian Star is a symbol used to signify membership in the Men of Letters. It is a six-pointed sign that represented great power and represented the gates of Atlantis. Henry Winchester wears one as a tie pin, and it is also seen on the gravestones of those murdered by Abaddon. It marked the door to their secret meeting place and decorates the box holding the Key to the Bunker. Henry also uses it to identify a shop where he can get the ingredients for the spell to use with the blood spell
The Unicursal Hexagram
The shape of the Aquarian Star is known as the Unicursal Hexagram, so called because it can be drawn unicursally - that is in one continuous movement. This is important when forming figures in magical rituals. The Unicursal Hexagram is described as the magical Star of Solomon, as opposed to the Star of David. The tribe of Solomon or the Masons use a similar symbol represented by a Square and Compass.
The symbol was used by the magical society known as the Golden Dawn, and later adapted by Aleister Crowley and those following his philosophies known as Thelemites. Crowley’s adaptation of the unicursal hexagram has a five petaled rose, symbolizing a pentacle and the divine feminine in the center, the symbol as a whole making eleven (five petals of the rose plus six points of the hexagram) -- the number of divine union.
The Men of Letters Chapter in Rhode Island uses a variant of the Aquarian Star with an eye at its center. It can be seen throughout the chapterhouse, and as tattoos on Diego Avila and the other Men of Letters and their legacies. The Eye recalls the Eye of Providence which is a symbol of the eye of god. It is strongly associated with Freemasons, and also features on U.S. paper currency.
- When Dean and Bobby first summon Castiel, the hexagram can be spotted amongst the sigils on the walls.
- The shape was also one of the many magical symbols on Mary Campbell's charm bracelet.
- The star can be seen on the curse boxes in 7.16 Out with the Old.
- The Unicursal Hexagram also forms part of a symbol known as "The Seal of Orichalcos" which appears in the Japanese games and anime Yu-Gi-Oh!.