Here is my prediction for the name of Apple’s foldable iPhone.

We are (roughly) in the 20th year of the iPhone. At year ten, Apple introduced the iPhone X, a real break from the past with a new design and a new way of interacting with the device.

Now it has been another ten years. (Not really, but they skipped the iPhone 9 to call it X, so they obviously don't care about precision.)

X is the Roman numeral for ten. XX is twenty. A foldable iPhone has two displays.

iPhone 2X

Twenty years (XX). Two screens (2x).

You heard it here first.