I completely forgot the 12-inch one existed.

Okay, the old ones that apparently have both do have the Thunderbolt symbol on the ones that are, though, so what’s the problem?

Why would you need them on a MacBook? They’re always* Thunderbolt.

Edit: Better explained by GamingChairModel below. I entirely forgot one series of MacBook, and also forgot when the older ones did have the Thunderbolt symbol on them.