Spool may refer to: Bobbin, a cylinder or reel on which a quantity of thread, yarn or wire is wound for use in a particular machine or device Cable reel, used to carry various types of electrical wires Spool (record label), active 1998–2008 Spool (software company), a software company that allows users to save video and text onto their mobile devices to view the content offline Spool pin, a type of pin used in pin tumbler locks to prevent picking Simultaneous Peripheral Operation On-Line, Spooling, a form of multi-programming for the purpose of copying data between different devices The Spooler, an operating system enhancement that provided spooling facilities for some IBM computers Spool (aeronautics), the unit of rotating components inside a jet engine Spooling up, increasing RPMs and thrust in a jet engine after the throttle has been advanced