The ornamental design for a paperclip, as shown and described.
FIG. 1 is a front elevation view of a paper clip showing my new design;
FIG. 2 is a perspective view thereof, showing my new design from the top, front and side; and,
FIG. 3 is a perspective view thereof as seen from the bottom, rear and side opposite of the side shown in FIG. 2.
It is understood that the cross-sectional shape of the wire used in forming the paper clip is uniformly circular, as seen in the ends in FIGS. 2 and 3, throughout the claimed design.