What is the measurement unit in the figma UI here?

What is the unit of measurment displayed here for these device types in the figma UI? The internet says figma uses pixels, but that can’t be as an iphone 12 HxW is measured in 1000s of pixels (2532 x 1170 pixels) for example. I think it’s using the px concept, which doesnt’ jive with the pixels concept quite.

It’s a colossal product fail that no measurement unit is displayed.