QED

QED may refer to:

Quantum electrodynamics, a field of physics
QED (book), Richard Feynman's book about quantum electrodynamics
Q.E.D. "Quod erat demonstrandum", a Latin phrase used at the end of a definitive proof.
QED project, a database of mathematical knowledge

Arts

Q.E.D. (US TV series)
Q.E.D. (manga), a Japanese detective comic
QED (play), by Peter Parnell
Q.E.D. (BBC TV series), a British science series

Computing

QED (text editor)
Quantum Explosion Dynamo, an object in the computer game Commander Keen
Q.E.D. "Ripples of 495 Years", the last SpellCard of the extra boss, Flandre Scarlet, in the computer game 東方紅魔郷 ～ the Embodiment of Scarlet Devil

Broadcasting

KQED, the callsign for:
KQED-FM, a public broadcasting radio station based in San Francisco, California
KQED (TV), television station also based in San Francisco, California
WQED, the callsign for:
WQED-FM, a public broadcasting radio station, in Pittsburgh, Pennsylvania
WQED (TV), a public broadcasting television station, also in Pittsburgh, Pennsylvania

Companies

Quantum Effect Devices, a microprocessor design company

Translation

The word "QED" occurs as such in the following languages: English, Danish, Spanish, Korean, Italian, Japanese, Polish, Portuguese, Slovenian, Swedish, Wu, Chinese.

Translation(s) in other languages: German: Qed, French: QED (homonymie), Dutch: Q.E.D., Ripuarian: QED (Watt ėßß datt?), Romanian: QED (dezambiguizare), Thai: Q.E.D. (แก้ความกำกวม).