electron pair
In chemistry and physics, two electrons that are paired, such as in a covalent bond or a lone pair.
In a covalent bond, atoms share an electron pair.
Cooper pair
In superconductivity, a bound pair of electrons that move together. Named after Leon Cooper.
In the superconducting state, electrons form Cooper pairs (electron pairs).
Compound of 電子 (electron) and 対 (pair). A straightforward technical term.