Void

From VoidWiki

The word Void has two meanings in Voidwars: It can stand for the entire region in which this game is taking place ("The Void"), but Voids also refers to one of the five basic resources in the game. Voids are an interplanetary currency which can be used to purchase other resources on the Intergalactic Trading Post, or to buy Research Projects that your empire has discovered. Voids can be produced by planetary population working in a Commerce Facility, or gained from selling resources to other players on the Trading Post.