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Correction, since 1999, when NASA lost an entire Mars Climate Orbiter due to using Imperial units for... reasons?, after which everyone presumably took away the obvious lesson.

Still older than OnShape.

I maaaayyy have been rage-searching measurements that are no longer used in serious applications, but the US has this not-quite-imperial, not-quite-système-du-roi "customary measurements" thing and it is wild, because it does actually seem to get some IRL traction outside schoolkids being taught gratuitously odd things because they're"easier", always-legacy applications like plumbing, or, for some reason, online recipes.

Anyway, I'd always thought that US America used old British Imperial measures outside of the sciences, but no, they apparently have their own thing that might be "even weirder*.