gyroscopic exercise tool
A handheld gyroscopic exercise device that generates resistance when spun. Used for grip and wrist training.
from English power ball
I'm training my wrists with a Powerball.
Powerball (US lottery)
Refers specifically to the American multi-state lottery game. Not a generic term for lotteries.
The Powerball jackpot in the US is very large.
Borrowed from English 'power ball'. The exercise tool sense is a direct loan; the lottery sense is a proper noun from the US Powerball game.