hehe... i've seen that before, and have no idea what it means.
It's a reference to a thread on FR some time ago...I can't find the link...where the poster was trying to describe a decive used by a border patrol guard on him that was able to detect that he had recently undergone some radiological tests at a hospital. He was stuned (stunned) at this devices's acuracy. He described it as some type of small beeber (beeper). It was very funny and has never lived it down. I'll keep my eyes open for the link.