In Ontario, the OPP calls them "markers" over the radio. Registration stickers that were printed in different colors showing the month/year of expiry ended a few years ago. There are no longer any costs to "renew" your plate. That's because a lot of cop cars now have LPR's (license plate readers) that alert cops to plates that have issues.
Also in Ontario, the plate is registered to the owner, not the vehicle. You sell your car, you take your plate off it, put it on your next car.
Also in Ontario, the plate is registered to the owner, not the vehicle. You sell your car, you take your plate off it, put it on your next car.