Q

Q is the 17th letter of the modern English alphabet and the ISO basic Latin alphabet. It is also the 17th letter in the alphabets of many other languages, including Albanian, Azerbaijani, Cornish, Czech, Dutch, Finnish, French, Galician, German, Hungarian, Icelandic, Italian, Kazakh, Kurdish, Latvian, Lithuanian, Norwegian, Polish, Portuguese, Romanian, Russian, Scottish Gaelic, Slovak, Slovenian, Spanish, Swedish, Turkish, and Welsh.

In mathematics, Q may refer to:

* The set of rational numbers.
* The quaternions.
* The ring of integers.
* The field of rational functions.
* The quantum number.
* The queue data structure.

In computing, Q may refer to:

* The Q programming language.
* The QBASIC programming language.
* The QEMU virtual machine emulator.
* The QML user interface language.
* The Q programming language for the Nintendo DS.
* The Q programming language for the TI-83 graphing calculator.

In other fields, Q may refer to:

* The Q factor, a measure of the quality of an electrical circuit.
* The Q value, a measure of the efficiency of a nuclear weapon.
* The Q Continuum, a fictional universe in which the television series Star Trek takes place.
* The Q Continuum, a fictional universe in which the television series Babylon 5 takes place.
* The Q Continuum, a fictional universe in which the television series Stargate SG-1 takes place.
* The Q Continuum, a fictional universe in which the television series Farscape takes place.
* The Q Continuum, a fictional universe in which the television series Doctor Who takes place.