Question: what is the significance of 3 in the gift of the magi?
Answer: The three gifts had a spiritual meaning: gold as a symbol of kingship on earth, frankincense (an incense) as a symbol of deity, and myrrh (an embalming oil) as a symbol of death. This dates back to Origen in Contra Celsum: "gold, as to a king; myrrh, as to one who was mortal; and incense, as to a God."