Note:  Do not rely on this information. It is very old.

Bell Book

Bell, Book, and Candle (Cursing by), the popular name for excommunication from the ceremonies used. The "book" was that from which the sentence was read; the candle was kept burning during the reading and extinguished at its close, as a sign that the sinner's light in the Church was extinguished unless he should repent; the bell was rung to announce what was going on. Similar ceremonies were used in exorcism, with, of course, a different meaning.