green turtle with beautiful shell in side view

[ext Turtles are reptiles of the order Chelonia, most of whose body is shielded by a special bony or cartilagenous shell developed from their ribs. The term turtle is usually used for the aquatic species, though aquatic fresh-water turtles are also called terrapins. The term is sometimes used (esp. in North America) to refer to all members of the order, including tortoises, which are predominantly land-based. The order of Testudines includes both extant (living) and extinct species. About 300 species are alive today. Turtles are now highly endangered, largely due to beach development and over-hunting. See more at Wikipedia.org...]

s commonly known as shell include:An animal shell, the hard, rigid outer covering of an animal such as a mollusk or a turtle. The hard outer layer of some plant fruiting bodies such as nuts.A type of user interface in computer software, often an operating system shell, such as a Unix shell command line interpreter in the Unix operating system or the DOS Shell in MS-DOS. See shell (computing).An electron shell (energy level), consisting of a number of electrons in an orbital around an atomic nucleusThe short name (and Brand) of the Royal Dutch Shell energy multinational, and its US subsidiary Shell Oil CompanyA projectile with explosive charge, shot from a gun; typically shells are larger than bullets and shot from larger guns. See shell (projectile).In physics, see On shell and off shellA structural form, usually made of concrete, that principally derives its strength by virtue of its shape. The term is derived from the primary usage in the context of nature. For example, the shell of an egg, though very thin, is difficult to break because of its shape.A long, narrow, rowed watercraft. See racing shell.A sorting algorithm invented by Donald L. Shell. See shell sort. See more at Wikipedia.org...