In her Plato Prehistorian: 10,000 to 5,000 B.C. Myth, Religion, Archaeology, Mary Settegast reproduces a table (above) which shows four runic character sets; a is Upper Palaeolithic (found among the cave paintings), b is Indus Valley script, c is Greek (western branch), and d is the Scandinavian runic alphabet.The Ancient Wisdom: Origin of Writing [this kinda poor scan is one *I* did 20 or so years ago, and my online version of it died with tinypic; but of course, I feel famous. Even the caption was what I'd typed in, btw. Dunno who "ancient wisdom" is, maybe a FReeper? :^)]
(The graphic is one I scanned in the late 1990s at what was higher res back then, and it's floated around the internet and wound up on that website. Non-secure, so you'll have to visit the link to see it.)
Plato, Prehistorian: Myth, Religion, Archeology
Just republished by Steiner Press
https://marysettegast.com/plato-prehistorian-10000-to-5000-bc-in-myth-and-archaeology/
Upper Paleolithic writing recovered from Magdalenian cave sites (top) compared to characters in three early written languages: (b) Indus valley signs, (c) Greek and (d) Runic. Settegast (p. 28) after Forbes and Crowder, 1979.~ p 28