Shell : Shell (weapon)

Amongst other things, a shell is:

• the hard, rigid outer covering of an animal such as a mollusk or gastropod. See: animal shell.
• The Unix shell, the command line interpreter program in the computer operating system Unix
• An electron shell consists of a number of electrons in an orbital around an atomic nucleus
• The shorthand name for Shell Oil's line of convenience stores.
• shell (weapon): a projectile with explosive charge, shot from a gun; typically shells are bigger than bullets and shot from bigger guns.

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