This is a sequel to ASCII Puzzler 1: Part 1 and ASCII Puzzler 2: Arrows Depicting Movement, Things, or Pointing Out Objects, and a prequel to https://puzzling.stackexchange.com/questions/32439/ascii-puzzler-4-not-a-rebus.
Here is your rebus:
___ ___ ___ ___ ___
( ) ( ) ( ) ( ) ( )
( ) ( ) ( ) ( ) ( )
| | | | | | | | | |
| | | | | | | | | |
|_|___|_|___|_|___|_|___|_|___
|
-------------
|1.41421356237|
-------------
Hint 1:
Sorry if the roots (which are required to be square) are terrible.