Wiktionary
n. 1 (context electronics English) A coil of wire attached to the apex of the cone of a loudspeaker that provides the motive force to the cone by the reaction of a magnetic field to the current passing through it. 2 (context electronics English) A similar mechanism that positions the disk read-write head in a computer hard disk drive.
Wikipedia
A voice coil (consisting of a former, collar, and winding) is the coil of wire attached to the apex of a loudspeaker cone. It provides the motive force to the cone by the reaction of a magnetic field to the current passing through it. The term is also used for voice coil linear motors, such as those used to move the heads inside hard disk drives, which produce a larger force and move a longer distance but work on the same principle.
Usage examples of "voice coil".
Armed with that information, he placed a call to an old friend and communications specialist to inquire if, and if so, how a digital code could be multiplexed into a regular phone signal in such a way as to pulse the receiving voice coil to generate that order of field gradient.