Macbook Air - Mine is A2337. They do have arbitrary model numbers for all of their stuff too. Guaranteed they do the same thing with their pens, pencils, and other stuff. It's just that most consumers rarely pay attention to them. To be fair though, most of the apple model numbers I've seen are similar to what I said above which is not nearly as bad as how they do TVs lol.
Even Apple isn't great with that. They often have different models for earlier and later in the year, various variants of each size, and little distinguishing features other than model number- same as those monitors.
It just isn't as visible on their products as much, because they at least try to make it more simple for consumers.but monitors often have model line, size, and resolution short hand to differentiate as well.