Hamburger button - Wikipedia
Dorothy Howard

The hamburger button or hamburger menu (also known as options, hotdog or pancake) is a button placed typically in a top corner of a graphical user interface. It takes the form of an icon that consists of three parallel horizontal lines (displayed as ☰), suggestive of a list, and is named for its resemblance to the layers in hamburgers, pancakes, or a hotdog in a bun.