We claim the ornamental design for an incense burner, as shown and described.
FIG. 1 is a perspective view of an incense burner;
FIG. 2 is a side view of the incense burner of FIG. 1;
FIG. 3 is a side view of the incense burner of FIG. 1 opposite to the side of FIG. 2;
FIG. 4 is a top view of the incense burner of FIG. 1;
FIG. 5 is a bottom view of the incense burner of FIG. 1;
FIG. 6 is an end view of the incense burner of FIG. 1; and,
FIG. 7 is an end view of the incense burner of FIG. 1 opposite to the end of FIG. 6.
The incense burner is shown with a symbolic break in its length. The appearance of any portion of the article between the break lines forms no part of the claimed design.
The broken-line symbols on the surface in FIGS. 1, 4, 6 and 7 show portions of the article that form no part of the claim.