The Impossibility of Double Gallows

[-JKP-]

This depends on which transcription was used in voynichese.com .
The fact that it has its own 'basic Eva' code means that there must be at least 10 occurrences.
This is still not a lot of course.

...


So now I wonder: Is z merely a malformed m? Is m a small gallows?

I don't know what the glyph means in Voynichese, but if it were Latin, they would be two different characters. The difference in the slant is meaningful. In Latin and Greek, the loop on the right is an abbreviation symbol.