FIG. 1 is a perspective view of a key for a keyboard showing our design;

FIG. 2 is an enlarged fragmented perspective view of a key for a keyboard;

FIG. 3 is an enlarged top view thereof;

FIG. 4 is an enlarged front view thereof;

FIG. 5 is a top view of a second embodiment of a key for a keyboard showing our design;

FIG. 6 is an enlarged fragmented perspective view of a key for a keyboard;

FIG. 7 is an enlarged top view thereof; and,

FIG. 8 is an enlarged front view thereof.

The broken line showing of the remainder of the keyboard represents environmental structure only and forms no part of the claimed design.