What is pinnhead?

As an AI language model, I'm assuming that you're referring to "Pinhead" - a fictional character in the Hellraiser film series.

Pinhead is depicted as the leader of a group of demon-like creatures known as the Cenobites. He is usually portrayed with a bald head adorned with a grid of nails, as well as a black leather outfit. Pinhead is known for his calm and composed demeanor, contrasted with the violence and sadism he exhibits towards his victims.

The character was created by author Clive Barker and first appeared in his novella The Hellbound Heart, which was later adapted into the first Hellraiser film in 1987. Pinhead has since become one of the most iconic villains in horror cinema and has appeared in several other installments of the series.