Things that I have one of in each of multiple rooms in the house, and sometimes car:
Scissors
Pain killers
Packing tape
Tape measures
Eyeglasses (not necessarily the same prescription)
Clocks (of course)
Flashlights
Computers
We've got phone chargers in at least two rooms, plus spares in storage.
Microfiber cloths for cleaning eyeglasses are in a couple places.
Of course we have three computers, plus two smartphones.
Garbage can in every room seems so obvious as to not count.
Different room scissors are for different purposes, for us. The one in the kitchen is for food packaging and must never cut anything gross; the one in the craft zone is for yarn/fabric; only one (plus the pocket one attached to keys) is general-purpose.
