BC may refer to any of the following:
1. When referring to a command, bc is a language for performing arbitrary-precision math calculations. See our Linux bc command page for further information, syntax, and examples.
2. B.C. is short for "before Christ" and is a description of time before the birth of Jesus Christ. Some choose to use BCE (before common era) as a way to describe the same period and avoid religious connotation. See our computer history B.C. - A.D. 1000 page to see some of the early events in human history that helped with the development of computers.