The ornamental design for a self-hanging square edge notched ceiling tile, as shown and described.
FIG. 1 is a perspective view showing our new design for a self-hanging square edge notched ceiling tile;
FIG. 2 is a perspective view of the tile hanging from its notches;
FIG. 3 is a top plan view which is a mirror image of the bottom plan view; and,
FIG. 4 is a left side edge elevational view which is a mirror image of the right, top and bottom edge views.
The broken away symbols in the drawings indicate that the appearance of any portion of the article between the break lines forms no part of the claimed design.