The ornamental design for an iron, as shown and described.
FIG. 1 is a top front perspective view of an iron according to an embodiment of the present application, wherein only a portion of the sole plate is claimed;
FIG. 2 is a front view of the iron shown in FIG. 1;
FIG. 3 is a rear view of the iron shown in FIG. 1;
FIG. 4 is a right side view of the iron shown in FIG. 1;
FIG. 5 is a left side view of the iron shown in FIG. 1;
FIG. 6 is a top view of the iron shown in FIG. 1; and,
FIG. 7 is a bottom view of the iron shown in FIG. 1.
The broken lines shown in the drawings are for illustrative purposes only and form no part of the claimed design. The surface shading illustrated in the drawings is provided merely to highlight the contour of the design and is not intended to be illustrative texture or gloss.