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

Science

Biology

  • Seashell, a hard outer layer of a marine animal, found on beaches
  • Eggshell
  • Nutshell
  • Exoskeleton, an external covering of some animals
  • Mollusc shell
  • Bivalve shell
  • Gastropod shell
  • Shell, of a brachiopod
  • Turtle shell
  • 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), an explosive device fired from artillery
  • Shotgun shell, 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

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  • Coverage shell, the number of defenders guarding the deep portion of the field in American football
  • Conchiglie, a type of pasta

See also

  • Shell suit, a descendant of the tracksuit
  • Shel, a given name
  • Shels (disambiguation)

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