Sign (disambiguation)

A sign is an entity which indicates another entity.

Sign may also refer to:

Sign (mathematics), an indication of negative and positive numbers

Sign function, also known as the signum function

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" (Marcella Detroit song), from Dancing Madly Sideways (2001)

"Sign", a song by Susumu Hirasawa

"Sign-2", a different version of "Sign" from Berserk: Millennium Falcon Hen Seima Senki no Shō

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