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

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'.

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