Architecture and design

* Shell (structure), a thin structure ** Concrete shell, a thin shell of concrete, usually with no interior columns or exterior buttresses

Science

Biology

* Seashell, a hard outer layer of a marine animal, found on beaches * Eggshell * Nutshell *

Exoskeleton An exoskeleton () . is a skeleton that is on the exterior of an animal in the form of hardened integument, which both supports the body's shape and protects the internal organs, in contrast to an internal endoskeleton (e.g. human skeleton, that ...

, an external covering of some animals ** Mollusc shell *** Bivalve shell *** Gastropod shell ** Shell, of a brachiopod *

Turtle shell Turtles (order (biology), order Testudines) are reptiles characterized by a special turtle shell, shell developed mainly from their ribs, as well as keratinized toothless beak. Modern turtles are divided into two major groups, the Pleurodira ...

* Armadillo shell

Physics and chemistry

* Electron shell or a principal energy level of electrons outside an atom's nucleus * Nuclear shell model, a principal energy level of nucleons within an atom's nucleus * On shell and off shell, quantum field theory concepts depending on whether classical equations of motion are obeyed

Mathematics

* Spherical shell, between two concentric spheres

Organisations

* Shell plc formerly Royal Dutch Shell plc, a British multinational oil and gas company ** Shell Oil Company or Shell USA ** Shell Australia ** Shell Canada ** Shell Nigeria * Shell corporation, a type of company that serves as a vehicle for business transactions

Computing

* Shell (computing), a type of user interface and command-line interpreter ** Command-line interface, sometimes referred to as command shell ** List of command-line interpreters, programs occasionally referred to as shells ** Web shell, interface that enables a web server to be remotely accessed ** Unix shell, a shell for Unix-like operating systems ** Shell script, a computer program designed to be run by a shell ** Bash (Unix shell) ** Bourne shell * Read–eval–print loop, also known as a language shell * Shell account, a user account on a remote server * Secure Shell, cryptographic network protocol * Shellsort or Shell sort, a sorting algorithm by Donald Shell * Shell, an empty expert system

Entertainment

* ''Shell'' (2012 film), an independent drama film * ''Shell'' (2024 film), an American thriller film * Shell (theater), a curved surface for reflecting sound * The Shells, a musical group * "Shell (Of a Man)", a song by Saya Gray from ''SAYA'', 2025 * "Shells" (''Angel''), a TV episode * "The Shell" (''The Amazing World of Gumball''), a TV episode * Shell, a receptacle used in the Shell game * "Shell", a song by Arrested Development from '' Zingalamaduni''

Places

* Shell, Ecuador * Shell, Worcestershire, England * Shell, Wyoming, United States * Shell Lake (disambiguation), several places

Weaponry

Shell (projectile) Shell or Shells may refer to: Architecture and design * Shell (structure), a thin structure ** Concrete shell, a thin shell of concrete, usually with no interior columns or exterior buttresses ScienceBiology * Seashell, a hard outer layer of a mar ...

, an explosive device fired from artillery *

Shotgun shell A shotgun (also known as a scattergun, peppergun, or historically as a fowling piece) is a long gun, long-barreled firearm designed to shoot a straight-walled cartridge (firearms), cartridge known as a shotshell, which discharges numerous sma ...

, a type of shotgun ammunition

Persons with the surname Shell

* Art Shell (born 1946), American football player and coach * Brandon Shell (born 1992), American football player * Donald Shell (1924–2015), American computer scientist * Donnie Shell (born 1952), American football player * George Shell (disambiguation) * Karl Shell (born 1938), American economist * Rita Shell (1863–1950), British magazine editor

Other uses

* Racing shell, a watercraft * Shell (machinery), each half of a two-piece plain bearing * Coverage shell, the number of defenders guarding the deep portion of the field in American football * Conchiglie, a type of pasta