lateral thinking - ASCII Puzzler 3: The Trees

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.

Answer

Sorry if I come off as being flippant but is the answer just

The square root of two?

Because

As pointed out by fondor in the comments $\sqrt{2} = 1.41421356237\ldots$

and

This number appears to be attached to the 2nd tree making it a literal 'root' of tree '2'. Also, if the tree's root is required to be square as suggested by the hint then this would be the "square root of 2".