We claim the ornamental design for a head orientation block, as shown and described.
FIG. 1 is a perspective view showing a head orientation block;
FIG. 2 is a perspective view of the head orientation block,
FIG. 3 is a front view thereof,
FIG. 4 is a rear view thereof,
FIG. 5 is a left side view thereof.
FIG. 6 is a right-side view thereof.
FIG. 7 is a top plan view; and,
FIG. 8 is a bottom view thereof, where the broken line indicated by the bracket discloses variable width of the head orientation block.
The broken lines and brackets shown in the drawings depict portions of the head orientation block that form no part of the claimed design.
The break lines in the figures indicate that the appearance of any portion of the head orientation block between the break lines forms no part of the claimed design.
The person and attire shown in broken lines in FIG. 1 illustrate portions of the environment of the head orientation block and form no part of the claimed design.
The neck collar shown in broken lines in FIGS. 1-8 illustrate portions of the environment of the head orientation block, and forms no part of the claimed design.