B.C. or Before Christ is a term used to describe the period before the birth of Jesus Christ. There are several synonyms for this abbreviation, including BCE, which stands for before the Common Era. Another term used is B.C.E, or Before the Christian Era, and it is commonly used in academic contexts. BC is also an acceptable synonym for B.C. However, it is important to note that these terms refer to the same period in history and are interchangeable. Their use often depends on the context and preference of the writer or speaker. Regardless of which term is used, they all represent a time before the birth of Christ.