I have pretty much an unimaginative naming scheme. LV-1, -2 etc. where LV stands for Launch Vehicle. There's LV-2T which is a design with a tricoupler, -2TL which is a lander. LV-Prototype # for experimental or design & testing before giving it a designation. For example LV-Prototype 1 was the first launch in career mode, a capsule with a SRB attached to it. LV-Prototype 2 became LV-3 which is an interplanetary design for light payloads using Rockomax parts. I've only unlocked the Skipper so far, needed to do some testing to understand its capabilities. I have an aircraft that I named Swepper, for its swept wings.