The four living Creatures with four faces.
It is a map.
A crossing point in the universe.
A guide to our home.
Earth.
But 7 are needed.
https://en.wikipedia.org/wiki/Living_creatures_(Bible)
One at the foot, the other at the head, and most importantly, one at the Heart.
"Chevron 7 lock"
You are welcome.
The four faces give us X marks the spot.
But the Earth is in 3D space, not a flat map, so we must find two other markers, celestial poles.
Then were all 6 cross in 3D space, we can make the final 7th point.