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In the case of the X Display Server, it was the successor to the W Window System: <https://en.wikipedia.org/wiki/W_Window_System https://en.wikipedia.org/wiki/
by dredmorbius 2y ago
In the case of the X Display Server, it was the successor to the W Window System:
<https://en.wikipedia.org/wiki/W_Window_System https://en.wikipedia.org/wiki/W_Window_System>
That's in line with a number of sequential naming series, as in BCPL -> B -> C (programming languages), S -> R (statistics languages).
Arguably there are also IBM -> HAL and VMS -> WNT.