What is claimed is the ornamental design for a headphone, as shown and described.
FIG. 1 is a perspective view of a headphone;
FIG. 2 is a front elevational view of the headphone;
FIG. 3 is a rear elevational view of the headphone;
FIG. 4 is a top plan view of the headphone;
FIG. 5 is a bottom plan view of the headphone;
FIG. 6 is a left side elevational view of the headphone;
FIG. 7 is a right side elevational view of the headphone;
FIG. 8 is an enlarged partial view of the headphone taken from FIG. 1;
FIG. 9 is a sectional view of the headphone taken along line 9-9 of FIG. 2; and,
FIG. 10 is an enlarged partial sectional view of the headphone taken along line 10-10 of FIG. 9.
The broken lines immediately adjacent the shaded areas represent the bounds of the claimed design while all other broken lines are directed to environment and are for illustrative purposes only; the broken lines form no part of the claimed design.