My Arabic is nonexistent except for some swear words:-), but it's just another Semitic language: in Hebrew, it's Migdal Shemesh. That's how I know. 
 
 BTW, any thought on the dating ( use of numbers)? 
And, interestingly, the first shibriyya has an engraving of an eagle with down-turned wings: eery reminiscence of the Egyptian flag.
		 
		
		
		
		
		
		
		
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