Era name was an East Asian imperial practice of numbering years in an emperor's reign. It originated as a motto or slogan chosen by a the emperor. Different East Asian countries utilized slightly different systems:
... United States, has adopted a Book of Confessions[?]. The BOC contains the Nicene Creed, Apostle's Creed[?], Scots Confession[?], Heidelberg Catechism[?], Second Helvetic ...