supernumerary

A mature horse chestnut, it is festooned with glorious blooms every spring, and after a few weeks sheds hundreds of partially grown, supernumerary conkers, encased in spiky green coverings.

One-hour training is enough for people to carry a task alone with their supernumerary robotic arms as effectively as with a partner, study finds.

Because that's what Japanese company Exii recently premiered with their Jizai Arms — a robotic arm bag, or "supernumerary robotic limb system" that enables humans to control six additional AI robotic limbs.

He remembers the houses with high ceilings, Dresden china chandeliers and suits of armor in the corners; the men in creaking shirts; the Sunday roasts; the Harvard-Yale football games; the bustling of supernumeraries.

These experiments showed that humans can feel like these extra, or “supernumerary,” limbs are a part of their body.