Here’s vague question for you: In the context of mobile phones, what does ISA stand for?
Nothing, as far as I know.
A little context would help.
Yes, I know. 
Unfortunately, for reasons I needn’t go into, I have none.
Could it be a brand? I found this one.
Got a bit more context: google maps api allows you to draw polygons on a map. I believe ISA is related to such polygons.