NASA had/has 2 Orions: a "nuclear" and a "non-nuclear" ;-)

Orion, as a spacecraft name, originally referred to the plan to build spacecraft propelled by pooping nuclear weapons out the back and exploding them behind a gigantic pusher plate. It may not have public approval, but it's quite practical (aside from the bit where you poison the planet and trash every piece of advanced electronics in a thousand-mile radius) and very well known among nerd circles, so it's worthwhile to disambiguate.