Concrete block
FIG. 1 is a top perspective view of a concrete  block showing my new design; 
     FIG. 2 is an end elevational view thereof; 
     FIG. 3 is an opposite end elevational view  thereof; 
     FIG. 4 is a side elevational view thereof, the  opposite side being a mirror image thereof; 
     FIG. 5 is a top plan view thereof; and 
     FIG. 6 is a bottom plan view thereof.