I was just glancing at a book where the author says that "God is one" and uses the term tri-unity. He says that the word "one" when used in reference to God is a compound unity.
He then uses several examples to describe the triunity:
One God is Father, Son, and Holy Ghost.
One human is spirit, soul, and body.
One sun is unseen rays, seen rays, and felt rays.
One atom is proton, electron, and neutron.
One tree is bark, pulp, and sap
One egg is shell, albumin, and yolk
Water can have three forms, liquid, solid(ice), and vapor (steam)
He says
Throughout the Old Testament God continued to reveal Himself in an unfolding revelation. Much of that revelation came by the names that God revealed of Himself.
He talks about the names of God in the Old Testament such as Elohim, Adonai, Jehovah, and then goes on:
In the New Testament there is revealed a new compound name for God.
At His birth, He is called "Jesus"
Matthew 1:21
At His baptism, He became the "Christ" (anointed)
Matthew 3:16, 17
At His resurrection, He became "Lord"
Acts 2:34-36, Phil 2:8-11.
The name Lord Jesus Christ is not found once in the Gospels, but is found in some form fifty-five times throughout the rest of the New Testament. this is the meaning of Colosssians 2:9. Our Lord Jesus Christ is the fulfillment to us of every promise of God.