noun

• (Christianity) Chiefly preceded by the (three): the wise men who visited and gave gifts to the baby Jesus at the Epiphany (traditionally considered to be three in number and sometimes named Balthazar, Caspar, and Melchior, but the Bible does not state how many there were or their names).
• (astronomy, by extension) The three bright stars (Alnitak (ζ Ori), Alnilam (ε Ori), and Mintaka (δ Ori)) that form Orion's Belt in the Orion constellation.