It goes by other names in various church traditions.
In Hispanic and Latin culture, as well as some places in Europe, it is known as Three King's Day.
Epiphany is the climax of the Advent/Christmas Season and the Twelve Days of Christmas, which are usually counted from the evening of December 25th until the morning of January 6th, which is the Twelfth Day.
This is an occasion for feasting in some cultures, including the baking of a special King's Cake as part of the festivities of Epiphany.
The term epiphany means "to show" or "to make known" or even "to reveal."
In Western churches, it remembers the coming of the wise men bringing gifts to visit the Christ child, who by so doing "reveal" Jesus to the world as Lord and King.
The colors of Epiphany are usually the colors of Christmas, white and gold, the colors of celebration, newness, and hope that mark the most sacred days of the church year.
The traditional liturgical symbols of Epiphany are usually associated with the Magi.
The symbols include either three crowns or a single crown, various portrayals of the Magi or Wise Men, three gifts, a five pointed star, or a combination of a star and crown.
A more modern symbol of Epiphany is a globe or a stylized portrayal of the world.
Around January 6th, the symbol +C+B+M+ with two numbers before and two numbers after (for example, 20+C+B+M+12) is sometimes seen written in chalk above the doorway of Christian homes.
The letters are the initials of the traditional names of the Three Magi: Caspar, Melchior and Balthasar.
These letters also abbreviate the Latin phrase Christus mansionem benedicat, "May Christ bless the house." The beginning and ending numbers are the year and the crosses represent Christ.
Marking the lintels of doorways is an old European practice that originally had overtones of magic (protection of a house). However, the symbols are now used throughout the world and usually represent a traditional Epiphany prayer and blessing.
An Epiphany Prayer
Father, we thank you for revealing yourself to us in Jesus the Christ, we who once were not your people but whom you chose to adopt as your people. As ancient Israel confessed long ago, we realize that it was not because of our own righteousness, or our own superior wisdom, or strength, or power, or numbers. It was simply because you loved us, and chose to show us that love in Jesus.
As you have accepted us when we did not deserve your love, will you help us to accept those whom we find it hard to love? Forgive us, O Lord, for any attitude that we harbor that on any level sees ourselves as better or more righteous than others. Will you help us to remove the barriers of prejudice and to tear down the walls of bigotry, religious or social? O Lord, help us realize that the walls that we erect for others only form our own prisons!
Will you fill us so full of your love that there is no more room for intolerance. As you have forgiven us much, will you enable us with your strength to forgive others even more? Will you enable us through your abiding Presence among us, communally and individually, to live our lives in a manner worthy of the Name we bear?
May we, through your guidance and our faithful obedience, find new avenues in ways that we have not imagined of holding the Light of your love so that it may be a Light of revelation for all people.
We thank you for your love, praise you for your Gift, ask for your continued Presence with us, and bring these petitions in the name of your Son, who has truly revealed your heart.
*Text from here