Building Block

FIG. 1 is a first perspective view of a building block showing my new design;

FIG. 2 is a second perspective view thereof;

FIG. 3 is a front view of FIG. 1 ;

FIG. 4 is a rear view of FIG. 1 ;

FIG. 5 is a left side view of FIG. 1 ;

FIG. 6 is a right side view of FIG. 1 ;

FIG. 7 is a top plan view of FIG. 1 ; and,

FIG. 8 is a bottom plan view of FIG. 1 .

The broken lines in the drawings depict portions of the building block that form no part of the claimed design.