Sign (disambiguation)
# Sign (disambiguation)

A sign is an entity which indicates another entity.

Sign may also refer to:

## Communication

* Signage, the use of signs and visual graphics to convey information
* Signature, a handwritten depiction of someone's name or other mark used as a proof of identity and intent
* Sign (semiotics), anything that communicates a meaning
* Sign language, a languages that uses the visual-manual modality to convey meaning

## Mathematics

* Sign (mathematics), an indication of negative and positive numbers
   * Sign function, also known as the signum function
   * Sign of a permutation of a finite set

## Organizations

* Project Sign, a project by the U.S. Air Force to investigate unidentified flying objects (UFOs)
* Servicio de Inteligencia de la Gendarmería Nacional or Inteligencia de la Gendarmería Nacional Argentina, the Argentine intelligence service
* Scottish Intercollegiate Guideline Network, a Scottish group that develops evidence-based medical guidelines

## Music

* Sign (band), an Icelandic band
* Sign (Clock DVA album), 1993
* "Sign" (Mr. Children song), 2004
* "Sign" (Beni Arashiro song), 2010
* "Sign" (Flow song), 2010
* "Sign", a 2018 song by Exo from Don't Mess Up My Tempo
* "Sign", a 2001 song by Marcella Detroit from Dancing Madly Sideways
* "Sign", a song by Susumu Hirasawa
   * "Sign-2", a different version of "Sign" from Berserk: Millennium Falcon Hen Seima Senki no Shō
* Sign (Autechre album), 2020
* "The Sign" (song), a 1993 song by Ace of Base
* The Sign (Ace of Base album), a 1993 album by Ace of Base

## Surname

* Christopher Sign (1976–2021), American journalist

## Other uses

* Astrological sign, one of twelve sectors of the sky in astrology
* Medical sign, an indication of disease, injury, or abnormal physiological state
* Sign (TV series), a 2011 South Korean television series
