The first complete form is a triangle. If you take a course in computer generated graphics you will learn that all forms are created by the positions of triangles, yes circles, everything. If you have the Father, and the Son, you still have only 2 straight lines. But if you add the Holy Spirit you have your first complete form. So the Old Testament begins with God brooding over the waters.
Genesis 1:1 In the beginning God created the heaven and the earth.2 And the earth was without form, and void; and darkness was upon the face of the deep. And the Spirit of God moved upon the face of the waters.
Here we have two, right? No, we have three.
The third is Jesus who is “the water.” Check out this scripture. Christ also loved the church, and gave himself for it;
Ephesians 5: 26 That he might sanctify and cleanse it with the washing of water by the word. We are baptized “into” Christ.
Galatians 3:27. For as many of you as have been baptized into Christ have put on Christ.
If you are literalists you’ll have trouble with this. I recall a man who scoffed at the Bible saying that any fool could tell that people are not sheep. He was responding to the Bible verse, “Ye are my sheep.” Really! (1 Peter 2:25 For ye were as sheep going astray; but are now returned unto the Shepherd and Bishop of your souls.)
Finally for any remaining naysayers, there is the clear identification of Jesus not bearing the word, but being the word in John 1:1-14. And not only that He is identified as the person who actually performed the acts of creation in Genesis. For without Him was nothing made that was made. verse 3. Pretty clear.
God uses metaphors to describe the truth of a spiritual world through metaphors, symbols, icons, and allusions. Three shows up wherever there are decisions to make and leaders listed. The three main apostles are three. There are over 500 references to 3 in scripture. Have fun looking them up.