Vanity tags
Well, that's what Ohio calls its personalized plates.
Now, until a couple of years ago, my 'Alpha' cat wore COUGRR. I got those plates in 83 and renewed them every year since then even though the car has been in pieces since 1985! $60 a year for a car I couldn't even drive just so I could hold on to the plate.
Then, lo and behold, 12 years later, Ohio decided that my 73 Cougar, now
almost 25 years old, needed an emmission test. Cars over 25 years old are exempt. No way to get a test with the car in pieces so I had to forfiet the plates. Now somebody else has 'my' plate. Grrr

The worst thing is, that I can't even get another plate until the car passes a State vehicle inspection since it has been unregistered for more than a year. I will have to make a list of possible plates for the day
if I ever get it together again.
My wife's 70 Mach 1 wears EQUUS, which is Latin for horse. My buddy's 73 Mustang convert wears 351 CJ, and his Boss 429 has 429 HP.