There is a debate happening among web designers as well as website users: Do you like the hamburger button?
The hamburger button is a navigation button commonly used in mobile versions of websites and also used in some mobile apps like: Google+, Behance, Facebook etc. The purpose of the button is to signify there is a hidden menu lurking behind once clicked.
For history of the hamburger button, click here.
To see an in-depth study of the mobile menu, which includes the hamburger menu, click here.
We are actually in very early times when it comes to mobile menus, mobile websites, and mobile apps on tablets and phones. I suppose one of the reasons the hamburger menu is so heavily used is because we have not found a more acceptable standard.