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I forgot to explain: The CD-ROM one is also weird.
They're called ISOs because the CD-ROM filesystem standard is ISO 9660, and that's ISO as in the International Organization for Standardization (ISO*).

In a different world the file extension/file type would have been dot iso9660 and we'd... probably still be calling them ISOs, honestly, but DOS/Windows only supporting 3-character extensions at the time didn't help.

* blame the French. UTC stands for "Coordinated Universal Time", you know?"