Small arrow next to 'for' keyword

 
As I'm typing into the metaEditor I noticed a small arrow flashing next to the 'for' loop operator.  What is its significance?
 
clemmo:
As I'm typing into the metaEditor I noticed a small arrow flashing next to the 'for' loop operator.  What is its significance?

So if you click on "Tab",you will see the entire "for" snippet loop,

And also about other built in events such as OnTick and conditional loop "while" and conditional expression such as "if","else" and others.

It will write the whole snippet code,without writing it manually.
 
Thanks!