screen size
also called display size
The diagonal of a computing device's display panel, as a numeral with a length unit (reusing the spine LengthUnits dimension; e.g. a 14-inch laptop, an 11-inch tablet — inch is the catalogue convention, centimetre also admissible). For tablets and laptops this is a real BUYABLE size, not merely a descriptive spec: the same model line is configured across sizes in the buy box (a MacBook Pro in 14 vs 16 inch, an iPad Air in 11 vs 13 inch, a Dell XPS in 13 vs 15 inch), so where a seller offers several sizes each is a distinct version. Being a measurement facet it is axis-ELIGIBLE by default; which sizes are actually offered is a downstream Seedbed statement. DISTINCT from the device's chassis outer dimensions (the inherited `height`/`width`/`depth`, which measure the whole body's envelope) — this is only the visible display diagonal, listed separately on every spec sheet; and DISTINCT from the capacity bands `storage_capacity` (flash) and `memory` (RAM), which are discrete marketing tiers, not a measured length. Homes on Tablet and Laptop, NOT on the shared ComputingDevice parent: for a smartphone, screen size is model IDENTITY (an iPhone 15 and a 15 Plus are separate products), not a within-model buy-box choice.
Screen size is a measured figure, given in millimeters or inches.
It belongs to measurement — its measurable, physical facts.