What is tanu?

Some articles on tanu:

Saga Of Pliocene Exile - Torcs
... There are three kinds of torc made by the Tanu gold, silver and grey ... Gold Torcs are the original version, worn by all pure-blooded Tanu, as well as the inhabitants of the Daughter Worlds back in the Duat Galaxy ... Eusebio Gomez-Nolan, a human who was given the name Sebi-Gomnol by the Tanu, invented the silver and grey torcs, along with much simplified torc-like ...