Leosghost - 6:09 pm on Jul 4, 2012 (gmt 0)
American motorcycles, HOG ( yes I know it is Harley Owners Group..but it may not be trademarked ? and everyone knows what it means if they ride bikes :)..VTwin
V Twin..Vee Twin ..
The technique of getting a particular groups attention without doing it openly is known as "the silent dog whistle"..usually a political technique..but can be a way around trademark issues if one isn't an official dealer, garage etc....
legal advice it isn't..you can't get that here....not from fora, you'd need a lawyer..
but the above might give you some ideas of what might or might not be trademarked..
I'm pretty sure that "rollin' thunder" or "rolling thunder" is trademarked..