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In page DECSYSTEM-20:

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PDP-10 computers running the TOPS-10 operating system were labeled DECsystem-10 as a way of differentiating them from the PDP-11. Later on, those systems running TOPS-20 (on the KL10 PDP-10 processors) were labeled DECSYSTEM-20 (the block capitals being the result of a lawsuit brought against DEC by Singer,[citation needed] which made its own System Ten model, occasionally referenced in reporting as the "System 10"[1]). The DECSYSTEM-20 was sometimes called PDP-20, although this designation was never used by DEC.