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It takes the form of an icon that consists of three parallel horizontal lines (displayed as ☰), suggestive of a list,. The names refer to its resemblance to the menu that is typical exposed or opened when interacting with it.
Selecting (tapping or clicking) this button results in a menu being revealed (sliding out or popping up), which distinguishes it from a menu bar, which is always on display.
The icon was originally designed by Norm Cox as part of the user interface for the Xerox Star, introduced in 1981; it saw a resurgence starting in 2009 stemming from the limited screen area available to mobile apps.
The wider button may be reduced to three vertically stacked dots (displayed as a tri-colon or vertical ellipsis ⋮ ),. In the Microsoft Office 365 platform, a similar application menu consisting of three rows of three squares is displayed. 
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