Oh, that's to show what kind of vehicles the license holder is legally allowed to drive.

[He flips over the card, denoting the pictogram which corresponds with the letters. He gives a languid shrug.]

They left out self-moving houses and spaceships, but that's a normie for ya, eh? I'm surprised out of everything that's what you choose to comment on. Or are dashingly handsome wizards commonplace around here?