“US” is the trilogy. God the Father, Jesus the Son and The Holy Spirit. Gos manifests himself in 3 ways.
Incorrect. That is from Genesis, 1:26 and 1:27, and has to do with what the great scholar Rashi called the Lord's "humility"...
26. And God said, "Let us make man in our image, after our likeness
Rashi: From here we learn the humility of the Holy One, blessed be He. Since man was created in the likeness of the angels, and they would envy him, He consulted them. And when He judges kings, He consults with His Heavenly household.
The very next section shows that this is not referring to a trilogy...
27. And God created man in His image; in the image of God He created him; male and female He created them.