FIG. 1 is an elevational perspective view of a key purpose identifier showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a view similar to FIG. 1 which shows another embodiment of my new design;

FIG. 8 is an elevational perspective view of yet another embodiment of my design;

FIG. 9 is a top plan view thereof;

FIG. 10 is a left side elevational view thereof;

FIG. 11 is a front elevational view thereof;

FIG. 12 is a bottom plan view thereof; and

FIG. 13 is a perspective view similar to FIG. 8, the key shown in dotted lines being for illustrative purposes only and not a part of the design claimed.