Handheld Fan

FIG. 1 is a bottom, front, and left side perspective view of a handheld fan according to our new design; FIG. 2 is a front elevational view thereof; FIG. 3 is a rear elevational view thereof; FIG. 4 is a left side view thereof; FIG. 5 is a right side view thereof; FIG. 6 is a top plan view thereof; and, FIG. 7 is a bottom plan view thereof. The broken lines in the drawings depict portions of the handheld fan that form no part of the claimed design.