"Clamshell design" refers to a type of design commonly used for objects like laptops or cell phones, where the item is divided into two parts that open and close, much like a clamshell. Full definition
The company has also ditched the traditional clamshell design of past DS systems and made the 2DS a flat, almost tablet - like, piece of hardware. (gamecrazy.com)
Design The VX8300 features a traditional clamshell design with a very large 176 x 220 color display and support for a whopping 262,000 colors — plenty of room for V Cast content. (invictamenswatches.freeblog.biz)
Colorful accents add style, while the sleek clamshell design makes it comfortable to hold and helps to keep screens safe from scratches when closed. (amazon.com)