List of ecclesiastical abbreviations

In the Roman Catholic Church, the ecclesiastical words most commonly abbreviated at all times are proper names, titles (official or customary), of persons or corporations, and words of frequent occurrence. == History == Between the seventh and ninth centuries, the ancient Roman system of abbreviations used in the Catholic Church gave way to a more difficult one that gradually grew up in the monastic houses and in the chanceries of the new Teutonic kingdoms.

Source: Wikipedia — List of ecclesiastical abbreviations (CC BY-SA 4.0)