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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.The

**bow and arrow sign**is an endoscopic**sign**for determining the location of the ileocecal valve during colonoscopy.Identifying the ileocecal valve in a colonoscopy is important, as it indicates that the entire colon has been visualized.**Ghost sign**for a defunct clothing store in Salem, Massachusetts A**ghost sign**is an old hand-painted advertising**sign**that has been preserved on a building for an extended period of time. The**sign**may be kept for its nostalgic appeal, or simply indifference by the owner.Since

**AOL**owns these services, we can ensure you’re always using the most secure**sign-in**technology when accessing your email. 2. If you’d prefer to continue using your non-**AOL**email application, try removing and re-adding your account. Look for the**AOL**logo when you go to set it up again to activate the secure**sign-in**method. 3.