C. Petrus was the name of two Human Starfleet officers in the 22nd century.
(1.) In 2154, he was named as a Flight Software officer on the dedication plaque of the Columbia NX-02. (ENT: "Affliction", dedication plaque). In January of 2155, he was named as a Propulsion officer on directory placards at the Fleet Operations Center, Sol Sector. His office was in room #4227. (ENT: "Demons", directories)
(2.) In January of 2155, he was named as a Thermal Operations officer on directory placards at the Fleet Operations Center, Sol Sector. His office was in room #4306. (ENT: "Demons", directories)
These characters were named after Enterprise visual effects assistant editor Chris Petrus.