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In mathematics, the

**sign function**or signum function (from signum, Latin for "**sign**") is an odd mathematical function that extracts the**sign**of a real number. In mathematical expressions the**sign function**is often represented as sgn. To avoid confusion with the sine function, this function is usually called the signum function.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 seriesThe

**psoas sign**, also known as Cope's psoas test or Obraztsova's**sign**, is a medical**sign**that indicates irritation to the iliopsoas group of hip flexors in the abdomen, and consequently indicates that the inflamed appendix is retrocaecal in orientation (as the iliopsoas muscle is retroperitoneal).**Trousseau sign**is the name of two distinct phenomena observed in clinical medicine. Both are attributed to Armand Trousseau: .**Trousseau sign**of latent tetany;**Trousseau sign**of malignancy (aka migratory thrombophlebitis)**Sign extension**(abbreviated as sext) is the operation, in computer arithmetic, of increasing the number of bits of a binary number while preserving the number's**sign**(positive/negative) and value. This is done by appending digits to the most significant side of the number, following a procedure dependent on the particular signed number ...The

**ruble sign**, ₽, is the currency**sign**used for the Russian ruble, the official currency of Russia. Its form is a Cyrillic letter Р with an additional horizontal stroke. [a] The design was approved on 11 December 2013 after a public poll that took place a month earlier.The

**Sign**can refer to: . The**Sign**(Ace of Base album), an alternate name for the Ace of Base album Happy Nation "The**Sign**" (song), a 1993 hit from this album The**Sign**(Crystal Lake album)In Christian scholarship, the

**Book of Signs**is a name commonly given to the first main section of the Gospel of John, from 1:19 to the end of Chapter 12.It follows the Hymn to the Word and precedes the Book of Glory.