So, I know that Old and Middle English had several letters that we no longer use–æsc/ash (Ææ), ðæt/eð/edh/eth (Ðð) þorn/thorn (Þþ), ȝogh/yogh (Ȝȝ), œthel/ethel (Œœ) and ƿynn/wynn (Ƿƿ).
But I just came across a YouTube video that shows a new letter regarding documentation of a Welsh region whose historicity has not been confirmed. The letter first appears on screen at (0:40):
In other spellings, the letter seems to be replaced by U or W, but the narrator doesn’t explain the appearance of this letter.
At a guess, I’d say it’s a scribal abbreviation. That shows up in a lot of hand1written manuscripts, even down to the 17th century.
Since it seems to be filling in for a u or w (w can be a vowel in Welsh), it may just be a quick loop to finish the word, that the reader can easily fill in as they read the page.
I confess I am not familiar with Middle Welsh manuscripts, but it does not seem to be in terminal position or to abbreviate anything. Not sure what the difference is between a “normal” “v” and an alternate “v” [ETA Wikipedia says the letter is related to the Anglo-Saxon wynn, so basically a double u (and u = v)]
If it’s just a scribal abbreviation, it’s strange to me that the video would use it without explanation. Like if he had used the Tironian et (⁊), I would have expected some explanation. Otherwise, most people would be wondering why there is a number 7 in that text.
It’s not a V, really, in that it never goes /v/. It’s basically a W. They’re all members of the U-V-W family, though. We call it “wynn” but obviously it’s not the same.
I’m not Welsh, but a scholar of things Welsh: those whom I’ve heard discuss the character in a professional context (which was along the lines of “we need to create a wynn for the font we’re using for the book”). This was before it has a place in Unicode (thanks, MUFI [Medieval Unicode Font Initiative]). MUFI, who is a bit more rigorous in this regard, also calls it a V: Medieval Unicode Font Initiative (1EFC and 1EFD).
As far as I know, it is not currently in use in Wales. 1EFA (Medieval Unicode Font Initiative) is, though: Smörgåsbord . Only in graphic design contexts; the siren call of the ordinary keyboard is just too great for unique alphabetical characters.