The force of attraction between two-unit point masses separated by a unit distance is called? 

The force of gravitation between two masses is given as: 

$\mathrm{F}=\frac{{\mathrm{Gm}}_1{\mathrm{m}}_2}{{\mathrm{r}}^2}$ 

where m₁ and m₂ are the mass of objects and r is the distance between them.

G is the gravitational constant.

$m_1$ = 1kg = $m_2$, $r = 1 m$

$\Rightarrow \mathrm{F}=\frac{\mathrm{G}\times 1\times 1}{1^2}$

 $\mathrm{F}=\mathrm{G}$

Thus, the force of attraction between two-unit point masses separated by a unit distance is known as the universal gravitational constant.