Turntable

A turntable is a general term for any rotating platform, but is most commonly used in these contexts:

a phonograph (note that the increasingly skillful use of turntables by DJs to mix and scratch records has given rise to the term turntablism and has lead to professional CD players with the same capability)
a device used at some railroad facilities to turn locomotives or other rolling stock around, or onto one of several radially arranged rail tracks (a rotary transfer table), see: turntable (railroad) and also: [1]
a potter's wheel or pottery wheel, used for shaping spinning clay to produce circular pottery.
a lazy susan, used on a large tabletop so that items can reached from any sitting position.
a part of the controller for the music game series beatmania: use in the game is described in Beatmania IIDX and Beatmania III