# Qed

QED stands for:

- Quantum electrodynamics, a subfield of quantum physics
- The QED text editor, which was written by Butler Lampson and L. Peter German in 1967 and the predecessor of ed is, see ed ( text editor )
- Quadcap Embeddable Database, a Java-based open source database
- Quod Erat Demonstrandum eV, an association founded by young people, which supports gifted and holds mathematically oriented seminars, see State Mathematics Competition Bayern # Quod Erat Demonstrandum eV
- A brand name of the former British car manufacturer Marshall - Arter

Q. e d stands for:

- QED, Latin for: what was to prove completion of a proof in mathematics and philosophy
- Quod est dubitandum, Latin for: what is doubtful ironic variation of the above,

- Disambiguation
- Abbreviation