It is traditional to bless your house for the Epiphany.
Over the doorway to the home would be written the Epiphany Inscription:
20 + C + M + B + 10
The letters have two meanings. They are the initials of the traditional names of the Three Magi: Caspar, Melchior and Balthasar. They also abbreviate the Latin words Christus mansionem benedicat. May Christ bless the house.
The letters recall the day on which the inscription is made, as well as the purpose of blessing.
The crosses represent the protection of the Blood of Christ, whose Name we invoke, and also the holiness of the Three Magi sanctified by their adoration of the Infant Christ.
The inscription is made above the front door, so that all who enter and depart this year may enjoy God's blessing.
The inscription is made of chalk, a product of clay, which recalls the human nature taken by the Word of God in the womb of the Virgin Mary, by the power of the Holy Spirit.