sun lounge = S = sunspots

sun-stools n.

Unflattering hackerism for SunTools, a pre-X windowing environment notorious in its day for size, slowness, and misfeatures. X, however, is larger and (some claim) slower; see second-system effect.

--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.