Before the celebrations on the 12th night of Christmas, it was thought you would bring the household protection by writing the initials of the wise men (Magi) on your front door, with chalk.
The traditional names of the Magi are Caspar, Melchior and Balthazar. The initials CMB also form an abbreviation of the Latin words, ‘Christus Mansionem Benedicat’ (may Christ bless this house). The crosses in-between represent Christ. So, for this year it would be: