[As part of cross-referencing specs (#40), alignment on terms could be useful (and easy) too. I heard Alexis talk in terms of logical/physical displays. Screen Fold uses "screen", Window Segment uses "display" and "screen", Window placement uses "connected screens"]
This is still a valid documentation request that warrants attention at some point.
See https://webscreens.github.io/form-factors/ for some related cross-spec explorations.
@tidoust proposed:
via https://www.w3.org/2020/10/21-webscreens-minutes.html#t05