I claim The ornamental design for a turntable, as shown and described.
FIG. 1 is a perspective view of a turntable of the present invention;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The even broken lines show parts of the turntable that represent unclaimed subject matter and form no part of the claimed design. Additionally, the uneven broken lines define the bounds of the claimed design.