Billygoat

Billygoat is a fast food brand on Mars, known to serve hamburgers. Its logo features what seems to be a pentagram, and could be a reference to the Icon of Sin. The appearance of the goat's head in the pentagram is more reminiscent of the sigil of Baphomet, as associated with Satanism, and a symbol used by the Knights of the Templar for protective/warning uses.

It is based on a boss from one of the previous Doom games. As can be seen by it's name