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Adolf Kaegi has an uncontested letter iod (p. 2) which is necessary to explain certain verb forms involving double consonants (p. 47).
Is this supposition part of current scholarship? 126.96.36.199 (talk) 17:04, 8 February 2013 (UTC)
Not quite sure what you mean. The /j/ glide sound in reconstructed forms such as *pʰulakjō > φυλάττω/φυλάσσω? Sure, that is commonly accepted. But it doesn't really have much to do with this article. The "j" in those forms is a reconstructed sound in Proto-Greek, but it had vanished by the time the Greek alphabet was introduced, so it was never written and was never a letter. Fut.Perf.☼ 17:57, 8 February 2013 (UTC)
I have been casually reading up on Greek for 40 years, and had not encountered this until buying this book on Thursday.
There is no redirect on "iod" to take readers to wherever the explanation may be.
And Iōd is still commonly used to refer to the reconstructed /j/?
Well, it's basically just a variant spelling of the German word Jot, the German name of the letter "J", or of yodh, the Hebrew letter name. We do have a note about it under yod, which appears to be the more common spelling in modern English (though not specifically dealing with its application to Greek), and a redirect under Jot (letter) (which leads to a remark about Greek "j" in the J article). Our actual linguistic coverage of the grammatical phenomenon should be under Proto-Greek.
There once was a very crazy person here on Wikipedia (now banned) who had an insane infatuation with that symbol, and kept inserting all sorts of made-up nonsense about it in various places of the project, so maybe that's one reason why other editors have not felt much appetite for expanding on it.
Problem is, of course, that this thing can in principle be spelled in at least nine different ways (with "i", "j" or "y" in the beginning, and with "d", "dh" or "t" in the end), and most of the resulting spellings also have different meanings, so you'd run into lots of disambiguation problems if you were to give it more explicit redirect coverage. Fut.Perf.☼ 15:42, 9 February 2013 (UTC)