Thanks for the link. I've had a look. It seems like a good symbol, but it is a bit specialist. My idea is to have something very normal displayed slightly differnent. That way it wouldn't attract unwanted attraction, It would also be readily available. If I put that heart symbol in my car or made it into a badge, people (friends and family) would ask what it was for. We need something so normal that it would pass as a normal thing. We could put a car sticker in the car, but cut the corners off.