If you wanna indelibly print gang, prison, or any other designs on your skin without knowing what they mean, it's pretty much on you, I don't have any sympathy for them. Yeah, meanings can change over time, but the whole thing is just a starting place for working through networks to aid investigations, not an offense of any sort to actually have. Anyone with MS13, Aryan Nations, Latin Kings, 1 percenter, Crip/Blood, Yakuza, or any other thug tatts is only getting the attention they craved in the first place.