I don't recognize it, and one should not give much credence to some symbols from Mohanjodero making appearance in Rashtrakuta inscriptions.
While Sindhu-Saraswati civilization has its own script, it has not been deciphered and we do not even know its type with 100% certainity, though there is near absolute probability that it is an ideographic script. They are similar to Egyptian Hieroglyphs.The Hieroglyphs were no alphabetic, but ideographic.The alphabet was invented in Phoenicia (Levant) essentially from the clash of the Egyptian & Sumerian scripts.
The difference between Alphabetic and ideographic scripts is that : In Alphabetic script letters represent phonemes (basic sounds) ,and consist of Vowels (Sound pronounced with an open
vocal tract so that there is no build-up of air pressure at any point above the glottis.) and consonants (Sound articulated with complete or partial closure of the vocal tract); while In ideographic , a letter represent an idea or concept.
In ideographic script, writing is divested from pronunciation, the people living in Indus-Saraswati civilization may have been speaking proto-Tamil , but we would never be able to know it.
Example of Egyptian hieroglyphs
An example of Indus script:
Example of another undechipered script: Minonian Linear A
Phoenician script (first alphabetic script)
This a quote from mit.edu
"Now the Phoenicians who came with Cadmus, and to whom the Gephyraei belonged, introduced into Greece upon their arrival a great variety of arts, among the rest that of writing, whereof the Greeks till then had, as I think, been ignorant. And originally they shaped their letters exactly like all the other Phoenicians, but afterwards, in course
of time, they changed by degrees their language, and together with it the form likewise of their characters. Now the Greeks who dwelt about those parts at that time were chiefly the Ionians. The Phoenician letters were accordingly adopted by them, but with some variation in the shape of a few, and so they arrived at the present use, still
calling the letters Phoenician, as justice required, after the name of those who were the first to introduce them into Greece. Paper rolls also were called from of old "parchments" by the Ionians, because formerly when paper was scarce they used, instead, the skins of sheep and goats- on which material many of the barbarians are even now wont
to write.
I myself saw Cadmeian characters engraved upon some tripods in the temple of Apollo Ismenias in Boeotian Thebes, most of them shaped like the Ionian. One of the tripods has the inscription following:-
Me did Amphitryon place, from the far Teleboans coming. "
http://classics.mit.edu/Herodotus/history.mb.txt
A useful podcast on development of language:
BBC Radio 4 - In Our Time, The Written World, Episode 1
It is a linguistic group, but had strong racial character due its steppe origin which is predominantly Caucasoid.