Nomen

Nomen, is the true name of the people who are gifted. The gang learn this when they follow Luna to a cliff face with the words carved on. Before they found out about it, they were fond of referring to themselves as 'eclipse freaks'.

The word Nomen is very similar to the word Omen, and Will is first to notice this. He thinks it is a good name because he sees the powers they have as omens, and as a curse. But when the word is broken up it reads as 'No omen'. Perhaps that is its true meaning.