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  2. Sign function - Wikipedia

    en.wikipedia.org/wiki/Sign_function

    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.

  3. Bow and arrow sign - Wikipedia

    en.wikipedia.org/wiki/Bow_and_arrow_sign

    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.

  4. Ghost sign - Wikipedia

    en.wikipedia.org/wiki/Ghost_sign

    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.

  5. Ways to securely access AOL Mail - AOL Help

    help.aol.com/articles/allow-apps-that-use-less...

    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.