I didn't know that. You hear about the gypsies (and they aren't popular in Europe even today) but nobody ever talks about all the other symbols except the yellow star and the pink triangle.
Then there were the mentally and physically disabled. They didn't even get symbols. They just got eliminated.
I think they absolutely should mention the other symbols. Well maybe not the last 2.
Purple triangle=Jehova Witnesses or evangelical Christian
Brown triangle=Gypsies
Red triangle=Communist
Black triangle=common criminal