[JdeBP]

Some very lengthy pages on the subject of keyboards, no mention of ISO/IEC 9995-1 anywhere, nor any mention of "104-key", "105-key", "109-key" et al. in favour of some very confusing and idiosyncratic "ANSI", "ANSISO", "ISANSI" nomenclature instead, which the site proceeds to explain is confusing, wrong, and a popular (at least in the United States, the site says) misconception.

If it is confusing and wrong, it's a bad idea to base all of the other explanations on that terminology, because it just reinforces something that should not be reinforced. Yes, "109-key" can be off by as much as 20 keys; but it avoids implying the whole "ISO versus ANSI" nonsense, and making up things like "ISANSI" from whole cloth; and at least does imply that the important difference from "104-key" is 5 extra physical keys in various places.