Here's why:

* Similar electronegativity: Bromine atoms have the same electronegativity. This means they have an equal pull on the shared electrons in the bond.

* Equal sharing of electrons: Since the electronegativity is equal, the electrons are shared equally between the two bromine atoms.

* No dipole moment: Because the electrons are shared equally, there is no separation of charge within the molecule, and therefore no dipole moment.

Therefore, the bond between two bromine atoms is classified as nonpolar covalent.