Pinhead tattoos mean immortality and evil. Pinhead is a character in the Hellraiser series. Pinhead is immortal. His body will never rot. This also strongly suggests that he cannot die completely from physical attacks, and that he can easily transform or resurrect himself in hell.
Pinhead's famous ability is that he can summon spiked iron hooks and chains in spirit. These weapons can attack from various angles and can wrap, pierce or cut the victim. Chains can destroy concrete or stone, and can throw cars, stop trains and destroy them.