The "O" Antiphons are antiphons used to introduce the Magnificat at Evening Prayer on the last seven days of Advent. Each antiphon is a name of Christ, one of his attributes mentioned in Scripture: December 17: O Sapientia (O Wisdom) December 18: O Adonai (O Lord) December 19: O Radix Jesse (O Root of Jesse) December 20: O Clavis David (O Key of David) December 21: O Oriens (O Dayspring) December 22: O Rex Gentium (O King of the nations) December 23: O Emmanuel (O God is with Us) .
