D20

'D20' or 'D-20' may refer to:

★ d20 system, a system for role-playing games

★ d20, a twenty-sided polyhedral die

★ D-20, a version of the Roland D-50 synthesizer

★ Arriflex D-20, a film-style digital high definition movie camera

★ D20, a diffractometer located at Institut Laue-Langevin used in neutron research

★ Heavy water, or deuterium oxide (D2O or 2H2O)

★ 152 mm towed gun-howitzer M1955 (D-20), a Soviet artillery piece

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