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  2. iTunes - Wikipedia

    en.wikipedia.org/wiki/ITunes

    iTunes is a software program that acts as a media player, media library, mobile device management utility, and the client app for the iTunes Store.Developed by Apple Inc., it is used to purchase, play, download and organize digital multimedia on personal computers running the macOS and Windows operating systems, and can be used to rip songs from CDs as well as playing content from dynamic ...

  3. Sign function - Wikipedia

    en.wikipedia.org/wiki/Sign_function

    The signum function is the derivative of the absolute value function, up to (but not including) the indeterminacy at zero. More formally, in integration theory it is a weak derivative, and in convex function theory the subdifferential of the absolute value at 0 is the interval [,], "filling in" the sign function (the subdifferential of the absolute value is not single-valued at 0).

  4. Sign extension - Wikipedia

    en.wikipedia.org/wiki/Sign_extension

    Sign extension (sometimes abbreviated as sext, particularly in mnemonics) 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 ...

  5. History of iTunes - Wikipedia

    en.wikipedia.org/wiki/History_of_iTunes

    The iTunes media platform was first released by Apple in 2001 as a simple music player for Mac computers.Over time, iTunes developed into a sophisticated multimedia content manager, hardware synchronization manager and e-commerce platform. iTunes was finally discontinued for new Mac computers in 2019, but is still available and supported for Macs running older operating systems and for Windows ...

  6. At sign - Wikipedia

    en.wikipedia.org/wiki/At_sign

    At sign. The at sign, @, is an accounting and invoice abbreviation meaning "at a rate of" (e.g. 7 widgets @ £ 2 per widget = £14), [1] now seen more widely in email addresses and social media platform handles. It is normally read aloud as "at" and is also commonly called the at symbol, commercial at, or address sign .

  7. WhatsApp - Wikipedia

    en.wikipedia.org/wiki/WhatsApp

    WhatsApp (officially WhatsApp Messenger) is an instant messaging (IM) and voice-over-IP (VoIP) service owned by technology conglomerate Meta. [14] It allows users to send text, voice messages and video messages, [15] make voice and video calls, and share images, documents, user locations, and other content.

  8. AOL

    login.aol.com/account/create

    Join AOL today and enjoy free email, news, entertainment and more. Sign up for an AOL account in a few easy steps and access all the benefits.

  9. Apple TV - Wikipedia

    en.wikipedia.org/wiki/Apple_TV

    The Movies search box only searches the iTunes Store, not local hard drives and networks. Movies rented on Apple TV must be watched on Apple TV, unlike iTunes rentals, which can be transferred to any video-enabled iPod, iPhone, or Apple TV. Movies purchased on Apple TV can be moved to a video-enabled iPod or iPhone via iTunes.