the.com/shell

armor a creature builds from its own body, then leaves behind as a souvenir of having lived

means A hard protective outer covering — of a nut, egg, mollusc, or seed — and by extension any rigid casing, hollow frame, or the metal-and-explosive projectile fired from a gun.

from From Old English 'sciell,' meaning a husk or seashell, tied to a Germanic root suggesting something split off or cut away — a cousin of 'scale' and 'shale,' all sharing the sense of a thin, flaking layer. The military 'shell' (a hollow projectile packed with explosive) is a later, vivid borrowing of the same image: a thin hard skin around something within. 'Shell out,' meaning to pay up, likely comes from shelling peas or nuts — removing the husk to get at the goods inside.

the math
Nautilus shells spiral in near-perfect logarithmic curves
borrowed homes
Hermit crabs rent shells and line up to swap
sound myth
That ocean roar is just your own blood
war origin
Artillery shells named for their hard hollow casing
command line
Your computer's shell wraps the kernel like one
for instance

shell oil company — multinational energy corporation founded 1907, headquartered in the hague

shell scientific awards — annual prizes given since 1976 by the shell foundation for research

shell grotto margate — underground chamber in kent, england decorated with 4.6 million shells, created 1835

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