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[-JKP-]

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JKP wrote:

y is a very common symbol (abbreviation) in medieval texts. It is so common it is sometimes included as the last "letter" of the alphabet.

m is also very common. It is an abbreviation for -ris and its homonyms. It is also sometimes used as a paragraph-end marker.

Both are demonstrably identified with letters.

Yes, they are in Latin manuscripts. Here we are talking about the Voynich MS, and the Voynich symbol y is certainly not to be equated with the Latin abbreviation -us (when in word-final position).

Not just Latin manuscripts. Manuscripts that use Latin scribal conventions in other languages, like German. Scribes adapted them to common abbreviations in their own languages. Not all of them, but some of the common ones from Latin were used as-is or adapted. For example, g (the Latin -cis abbreviation) is used in German as the paragraph-end marker and sometimes the etcetera (et + -cis symbol). The Item abbreviation, which resembles k, was used in many languages.

In Latin-alphabet languages, y was not just -us. It was con/com and us/um. In other words, in the medieval mind, it had a number of meanings discerned by context. Which means, in the medieval mind, it could conceivably be stretched to include other common endings, as well.

I'm not saying the VMS is Latin (I hope people have heard me say that enough times now that I don't have to say it as often), but I think it's essential to understand how Latin scribal conventions and their flexible, contextual nature were deeply burned into the brains of medieval scribes.