Eleni

@Bob Key, as the islands on the Caribbean Sea!

@Mike R I’m Greek and it took me a while!

@John A point is dimensionless. You need two points to talk about dimensions.

@Emily Wiz Khalifa is a rapper, you need to go down following the note “la” to get the full answer to the clue.

@Steven M. First rebus letter is last letter of the first word in the across clue, and the second rebus letter is the first letter of the second word. (With the exception of CINDER BLOCK).