Hamburger icon as the menu symbol or not?

An interesting article about the so called "hamburger icon" says:

"... while the button may provide a consistent way to find extra information, research suggests it is not as functional as some might like to think it is.

"I did multiple tests," says James Foster, a web developer based in New Zealand, who has surveyed users' interactions with the button over the course of many months. "The results all came out the same - the icon is not as clear to some users as developers and designers think it is."

Adding the word "menu" underneath the three lines increases the button's use by 7.2%, according to Foster's tests.

Putting the hamburger inside a box, so it looks like a button, increases use by 22.4%.

Switching the lines for the word "menu" makes 20% more people click, Foster found."

Full article:

http://www.bbc.com/news/magazine-31602745