QED

QED may refer to:

• QED is the acronym that represents the Latin expression quod erat demonstrandum (‘what you wanted to prove’).
• English acronym of quantum electrodynamicsQuantum Electro Dynamics).

Other less common uses are:

• QED (Quick Editor), an online text editor of the 1960s that influenced the later development of UNIX text editors as ed or sam.
• QED, a 1985 book by physicist Richard Feynman on quantum electrodynamics.
• QEDa play written by Peter Parnell about Richard Feynman.
• Quantum Effect Devicesan electronics company.
• QED: a novel written by Gertrude Stein in 1903 and published in 1950 under the title "Things as they are".
• Q.E.D. ~Shomei Shuryo~: Japanese sleeve written by Motohiro Katou.