Building Block

FIG. 1 is a top perspective view of a building block;

FIG. 2 is a bottom perspective view of a building block;

FIG. 3 is a top view of a building block;

FIG. 4 is a bottom view of a building block;

FIG. 5 is a side view of a building block;

FIG. 6 is a side view of a building block;

FIG. 7 is a rear view of a building block; and,

FIG. 8 is a front view of a building block.

The broken line portions of the drawings are included to show portions of the building block that form no part of the claimed design.