Replying to Question/statement ns gesture

we need one badly, a hand signal that can be made to show that you are a member. too many times have i gone by a car on the interstate plastered with 4bi9 stickers and tried to race them or do something to get them to recognize me as a member, or seen someone driving with a ec headwear hat on and they flash up peace signs and such, and im sure they are a member but i cant non-verbally announce that i am as well. ive been in other non vehicle situations as well, if you NS throw it up! if there isnt a gesture already lets think of one.