A connect after quite some time.
Hints: The symbol is the last alphabet in an Indian language. And the gap to which the arrow points towards actually has a name.
Happy quizzing, and have a nice life, folks!
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Looks like this one is too tough. No answers so far! The connection is musical bands from West Bengal / Poschim Bongo, or more specifically, Kolkata. The first is Fossils, the second is Chandrabindoo, the third is Cactus, and the fourth is Cassini’s Division. Will try to make it easier this time.