We claim the ornamental design for a ladder rung, as shown herein.
FIG. 1 is a perspective view of a ladder rung with a square tube shown in broken lines;
FIG. 2 is a top view of the ladder rung of FIG. 1;
FIG. 3 is a front view of the ladder rung of FIG. 1;
FIG. 4 is a bottom view of the ladder rung of FIG. 1;
FIG. 5 is a left side view of the ladder rung of FIG. 1;
FIG. 6 is a rear view of the ladder rung of FIG. 1;
FIG. 7 is a right side view of the ladder rung of FIG. 1;
FIG. 8 is a perspective view of the ladder rung in a ladder assembly for a hunting tree stand with additional rungs of the ladder assembly, side rails of the ladder assembly, the hunting tree stand, and a tree shown in broken lines; and,
FIG. 9 is another perspective view of the ladder rung in the ladder assembly.
A description of the figures for each of the figures of the drawings is as follows, wherein subject matter shown in broken lines indicates unclaimed subject matter that forms no part of the claimed design.