The universal law of gravitation, written by Isaac, says that any two objects in the universe attract each other by a force called.

The universal law of gravitation describes the force called the gravitational force (surprise!)

Isaac wrote the whole three books of his gigantic research on

Mechanics all in Latin.

I spent some time online, trying to find what he called the force

in the original Latin of his books, but I haven't found it yet.

Every English translation of this important work of Isaac's

calls it 'gravitation' or 'the forces of gravity'.