I remember reading a while back about a particle that had to spin twice before it looked the same and it blew my mind but I forgot the name of this particle. I think its something like a 1/2 turn particle. Any ideas what this might be?

This is a Physics question. I think this is a property of a particle (like an electron) with a fractional spin. It is weird!

Ah I wasn't sure what topic it fell under haha I'm not really science guy (I go to art school)