hamburger menu

The hamburger menu button is a symbol consisting of three parallel horizontal lines. It is often displayed in the top left or top right of a user interface. It is called a “hamburger button” for its resemblance to a hamburger, the top and bottom lines representing the bun and its middle line representing the hamburger filling:

That works like placeholder for second-order functions. Click/touch on a hamburger button typically results in a menu of pages or options:

Web designers are making their case for the icon in minimalistic portfolios as well as commercial and educational designs. Feel free to check the examples of hamburger menus on the following link.