Apparently, that’s the name of the new launch vehicles that NASA wants to develop, which will be announced in a couple hours. The Crew Launch Vehicle (heretofore called CLV) will be the Ares 1, and the Cargo Launch Vehicle (previously known as the CaLV) will be the Ares 5. A tribute to the Saturn numbers, I guess, and an indication of the ultimate planned destination (Barsoom).