What about when you fly an experimental type that is not mainstream? "Waiex on downwind for 30" - most don't know what that is. I could say "Silver mini-bonanza that is sort of like a slow RV6" but that gets wordy for me. Even with a generic "experimental 1YX" people know where to look and that I'm not a Cessna, Piper, or the like. Still better than the guys with no radio.