This text is from Crowley's Book of Thoth.
The number Nine, Yesod, inevitably brings back the balance of Force in fulfillment. The card is ruled by Venus in Virgo. It shows good luck attending material affairs, favour and popularity.
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 hexagon. This signifies the multiplication of the original established Word-by the mingling of "good luck and good management". The three central disks are of the magical pattern as in earlier cards; but the others, since the descent into matter implies the gradual exhaustion of the original whirling energy, now take on the form of coins. These may be marked with the magical images of the appropriate planets.
As a general remark, one may say that the multiplication of a symbol of Energy always tends to degrade its essential meaning, as well as to complicate it.