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