I was on a standards committee that was designing a tabular-format spec sheet standard for digital copiers. (ISO, EU, sigh.) We wanted to include an entry for number of output dots per linear unit. All the companies on the committee (all the Big Names) used metric for everything but that; we all used DPI. We put that into our draft, defined as “dots per 25.4mm”, but ISO was not amused. We had to change it to “resolution”, which is not the right term for output. That’s what you see in standard-format spec sheets now, although I see that Xerox is using “output resolution”. (Example)
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