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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

See also

• Signs (disambiguation)
• Signing (disambiguation)
• Signify (disambiguation)
• Sign-Trace
• Sine, a trigonometric function of an angle
• Sine (disambiguation)

• Disambiguation pages