The Etymological Dictionary of Greek has arrived
https://www.logos.com/product/55648/etymological-dictionary-of-greek
It has some rectangles instead of glyphs, like ⮘PG?(V)⮚
What I could find Unicode characters (U+2B98) and (U+2B9A). It is some sort of arrow.
Anybody who has the print version could check what kind of character is intended?
Not a big deal, but probably easy to fix