"Pyramid Head, also known as "Triangle Head" (三角頭) in Japan, is a fictional monster from the Silent Hill video game series, introduced in the second installment, Silent Hill 2. There it serves as a symbol of the protagonist's repressed guilt and anger over murdering his wife.

Of the creatures that appear in Silent Hill 2, Pyramid Head is one of the few that is overtly masculine in appearance, whereas the other monsters generally have feminine features to them, with the exception of the Doormen/Abstract Daddy. Pyramid Head resembles a pale, muscular man covered with a white, blood-soaked robe reminiscent of a butcher's smock. His most outstanding feature is a large, red, triangular helmet that covers his head completely. It was reportedly designed to appear painful to wear, suggesting that it serves as some kind of punishment. In interviews with the chief artist responsible for creating the character it is stated that the initial thought process behind the pyramid shaped helm was to create an iconography of "pain". In other accounts the helmet has been described as an elaborate executioner's mask."

Source: Wikipedia, "Pyramid_Head", available under the CC-BY-SA License.