The Thoth Deck Nine of Disks (Pentacles in Golden Dawn and Ryder-Waite decks) is called, Lord of Material Gain, or Gain for short
The Planet is Venus and Virgo is the sign. Angels of the Decan are: Hazayel and Aldiah. This card is Yesod in Assiah and/or the influence of Yesod in the Material World. Yesod, meaning foundation, in the material world this influence is very favorable for amassing things, but with Venus in Virgo, there is a lack of overt feelings accompanying this great efficiency.
This efficient amassing of material things, is shown by the design complexity of Crowley's Nine of Disks. As he states in his book of Thoth,"The Disks are arranged as an equilateral triangle of three, apex upwards, close together; and surrounded at some distance by a ring, six larger disks in the form of a hexagram. This signifies the multiplication of the original established Word by the mingling of 'good luck and management'." Which says it all for this card. [Illustration of the Four Worlds and Tree of Life are from: THE QUABALISTIC TAROT, by Robert Wang]
When the Nine of Disks-Gain, is thrown during a reading it implies, inheritance and/or material gain, sometimes within 9 weeks or 9 months or the querent is experiencing it now for those time periods. A certain amount of Integrity, skill and talent has produced material gain and a sense of accomplishment. This is a purely material gain card, where talent and skill has come together in either a beginning stage of material gain or a good flowing gain on into wealth.
If ill defined by accompanying cards, it could mean a lack of discipline in material matters and the failure that comes with it.
Thank you for your interest and comments. May you live long and prosper!