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That's interesting. I've never encountered "datums" but a quick Google search turned up plenty of examples (like "Tidal Datums") and that "This plural is permissible only in the sense of 'fixed reference points'" [1].

Which contexts did you have in mind?

[1] https://en.wiktionary.org/wiki/datums




Yes things like surveying and mapping was what I was thinking—similar.




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