A term used to describe a cell phone (also referred to as flip phone) or computer that has a fold in the center, allowing the device to open and close. On an open phone, the user has access to the keypad and can view the LCD. When closed, it is compact and allows for easy storage. The picture is of a Motorola Razr, an example of a clamshell cell phone. One of the most famous clamshell computers was the Apple iBook laptop.