Spool can mean one of the following:

• Spool, a usually low-flanged or unflanged cylinder on which thread, wire, cable, paper, film, or tape is wound for distribution or use.
• Bobbin, a cylinder or reel on which a quantity of thread, yarn or wire is wound for use in a particular machine or device.
• Spooling, Simultaneous Peripheral Off-line Output Listing, temporary data storage in computing.
• Spool, a shaft of a gas turbine engine. Spooling up usually refers to a jet engine spinning up.
• Spool, a large spa/small pool (an insulated inground small pool with spa jets built-in, named by Insulated Water Structures).
• Spool, a verb used to describe a turbocharger or supercharger on a car engine beginning to spin and deliver power.
• Spool, a term for a solid axle, one which does not have a differential to allow a wheel speed difference from side to side.
• Spool, TAYON

a band from London, Canada in the 1990s who released music on Derivative Records as well as a song on a Purderous Magina Records compilation.

• Spool, the process of reading and writing input and output streams on auxiliary storage devices on an IBM mainframe