Frank: A BB is a small round piece of lead or steel that looks like a very small ball bearing. Everything has changed since I was young just after the big bang, but back then we used them in our toy rifles. The rifles were spring loaded, and whey you worked the lever it would load one BB in the chamber so you could fire it. About the only thing the gun was good for was to accidentaly shoot some one in the eye, but we thought they were fun. In this day of political correctness and over reaction to everything I doubt you can still buy the toy guns. Thanks for the information about the triangle. It has been a long running mystery. Allen
