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ISO for me means UK ISO and I believe that's the case for a lot of people. As Jae from Top Clack what ISO is and he will probably not talk about ANSISO
The erroneous (YMMV) conflation of "UK English national layout" and "ISO physical layout" is a big part of the reason for the confusion, and that's what needs to change in order to solve the "ISO disagreement" (to call it mildly).
This is why I've taken to write "UK English over ISO" and "US English over ISO or ANSISO" in full all the time, to make it clearer (even if it does come off as a bit pedantic). Once we get past that confusion, we could talk about "exotic" stuff as well, like the German layout over ISANSI (something that CAN be done, thanks to wodan's HADapter).
Is ANSISO really used as a layout? I assumed it is less used than pure ISO alone but I might be mistaken.
It is, obviously, not seen a lot today, but back in the '80s it was common to see ANSISO keyboards for personal computers; remember that during that time, terminal keyboards ALL had vertical Enter keys ("regular ISO" in IBM keyboards, or "thin ISO" in DEC and DEC-style units), so many users preferred the vertical Enter over the horizontal ("ANSI") one, even while using the US English national layout. Check out this
Ortek MCK-142 keyboard for a particularly good example of it.
NOWADAYS, as people into this hobby try out things and build their own keyboards, they can well try out the vertical Enter! And if using the US English national layout, they don't HAVE to suffer with the "short left Shift" if they don't want to, either. Modern PCBs support either Enter key without issue and are capable of transparently determining the position of the
\| key (R2 or R3), so... let the users have the option to use horizontal or vertical Enter keys (*). Even if they are 'muricans with no interest in using anything other than the US English national layout and the long left Shift.
(*) But not BAE. EEEEWWWW.