Window Blind Slat

FIG. 1 is a top, front, right perspective view of the claimed design for a window blind slat;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a front view thereof, wherein the rear view is identical thereto; and,

FIG. 5 is a left view thereof, wherein the right view is identical thereto.

The break lines symbolize breaks in the length of the article in which the claimed design is embodied. The appearance of any portion of the article between the break lines forms no part of the claimed design.