Ti (pronounced tai or tie) was the dodecahedron as stated first by the male Savant Deedrix who argued against the Dion Lexa in the arguing chamber.
Again the dodecahedron was said to be a god by General Draham Mcgregor when he spoke to Meglos.
Meglos informed us that Ti, the dodecahedron, was made on Tigella and was an extremely potent power source, which the Deons and Savants were using only at a fraction of its potential. (Its potential was about twelve times that of what it's current output was. Meglos said its equal to all the energy in the Universe.)
Ti, which was, through out their arguments, refered to as she, is both the Dodecahedron and a metaphysical form conjured through beliefs. The blessings of Ti through the Dion Oath showed this metaphysical connection to the power that the dodecahedron contains. (DW: Meglos)