The Goetic Spirits
The 72 Spirits of the Goetia, with their titles, seals, and legions, taken from the Lesser Key of Solomon, who bound and rules these Spirits.
These Spirits can be seen as 'stepped down' versions of the 7 Planetary Gods (see "777" for how the correspondences branch out from here).
The Gods they descend from are given on either side of their title. The symbols are the planet associated with a given number e.g. Mars (♂︎) for 5, Venus (♀︎) for 7 etc.
Numbers larger than 9 are reduced (compressed) by adding their digits together. So for Earl Ipos, the 22nd Spirit: 22 -> 2 + 2 = 4 = ♃ = Jupiter.
The symbol on the left of the title is the God derived from the Spirit's number.
The symbol on the right is derived from converting each letter in the name to a number: Ipos -> 8 + 15 + 14 + 18 = 55 -> 5 + 5 = 10 -> 1 + 0 = 1 = ☿ = Mercury.
The real gender of some Spirits is also here revealed e.g. Duchess Astaroth, Queen Paimon, the Marquise Phoenix, Countess Maltas etc.