Darn, I was just at my friends ammo store (I go once every two weeks). I could have surely picked up a box. I looked at my boxes and do not have this symbol, but I also do not have the .303" box this round came out of. I will ask the person I got the round from, to bring the box over this weekend. He was just here last night. You know, I did not check my .22 rimfire boxes. I have to leave for my mothers Birthday party (she is 86), but I will check those later.