Cap for a writing instrument
FIG. 1 is a front elevational view of a cap for a writing instrument showing my new design; 
     FIG. 2 is a left side elevational view thereof, the right side being the same in appearance as the left side; 
     FIG. 3 is a rear elevational view thereof; 
     FIG. 4 is a top plan view thereof; and, 
     FIG. 5 is a bottom plan view thereof.