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Hydride ion

Anion of hydrogen with one proton and two electrons; participates in NAD+/NADH redox.

H- carries two electrons and one proton; its transfer underlies hydride-shuttle redox chemistry of NAD(P)+/NAD(P)H coenzymes used by dehydrogenases.

How one textbook covers it

Advanced Nutrition and Human Metabolism, 8th ed. (Gropper) — Glossary
H- carries two electrons and one proton; its transfer underlies hydride-shuttle redox chemistry of NAD(P)+/NAD(P)H coenzymes used by dehydrogenases.

Dehydrogenases, Hydrogen ion