The Epiphany Blessing is done with chalk especially blessed for the occasion.  With it the priest writes the following legend at the top of the door of the house: 20 + C + M + B + 22. The three letters stand for the three kings who were traditionally known as Caspar, Melchior, and Balthazar. The numbers, of course, indicate the year in which the blessing was given.  Incense is used in this blessing, presumably in remembrance of the incense offered by the Three Kings.

In religious houses the legend is written over the door of every room. Like the other blessings of homes, this one is meant to invoke protection over the mind and body of those who dwell within. In this instance the priest prays:

Bless, O Lord, Almighty God, this home, that in it there  may be health, chastity, strength of victory, humility, goodness, and industry, a fullness of law and the action of graces through God the Father, and the Son, and the Holy Ghost; and that this blessing may remain on this home and on those who frequent it. Through Christ our Lord. Amen."