BC (for "Before Christ") is an abbreviation used to refer to a year before the beginning of the yearcount that starts with the supposed year of the birth of Christ.
Some people use ACN or BCE instead.
See also AD and CE.
... Confession of Faith[?], Westminster Shorter Catechism[?], Westminster Larger Catechism[?], Theological Declaration of Barmen[?], Confession of 1967[?], and A Brief ...