I had one of these. I was given it not having slightest idea what it was for (was only in the NYC/US about two years at that point). I was told its meaning a c

I had one of these. I was given it not having slightest idea what it was for (was only in the NYC/US about two years at that point). I was told its meaning a couple of years later when I found it again during a move. I've thrown it out. While I appreciate the gesture from the person who gave it to me, I was repelled by what it represented in terms of how privilege and the police system work.