Tattoos of the Bloods are pretty basic. You will see P for "Piru" or B for "Blood." Another popular Blood symbol is CK. This can stand for "Crip Killer" or "Cop Killer." This inmate sports a P for "Piru" and marking him as a member of the Piru Street gang, a Compton-based Blood set. Many non-Crip gangs formed a coalition opposed to the Crips, often using the names Bloods or Pirus.