Looks like Unicode has somehow missed out one of them.
+8-cell mosaic unification
+=========================
+
+These cell patterns are missing from the main set of block octants,
+apparently because they're unified with something else:
+
+00 U+0020 SPACE etc
+01 U+1CEA8 LEFT HALF UPPER ONE QUARTER BLOCK
+02 U+1CEAB RIGHT HALF UPPER ONE QUARTER BLOCK
+03 U+1FB82 UPPER ONE QUARTER BLOCK
+05 U+2598 QUADRANT UPPER LEFT
+0A U+259D QUADRANT UPPER RIGHT
+0F U+2580 UPPER HALF BLOCK
+14 U+1FBE6 MIDDLE LEFT ONE QUARTER BLOCK
+28 U+1FBE7 MIDDLE RIGHT ONE QUARTER BLOCK
+3F U+1FB85 UPPER THREE QUARTERS BLOCK
+40 U+1CEA3 LEFT HALF LOWER ONE QUARTER BLOCK
+50 U+2596 QUADRANT LOWER LEFT
+55 U+2588 LEFT HALF BLOCK
+5A U+259E QUADRANT UPPER RIGHT AND LOWER LEFT
+5F U+259B QUADRANT UPPER LEFT AND UPPER RIGHT AND LOWER LEFT
+80 U+1CEA0 RIGHT HALF LOWER ONE QUARTER BLOCK
+A0 U+2597 QUADRANT LOWER RIGHT
+A5 U+259A QUADRANT UPPER LEFT AND LOWER RIGHT
+AA U+2590 RIGHT HALF BLOCK
+AF U+259C QUADRANT UPPER LEFT AND UPPER RIGHT AND LOWER RIGHT
+C0 U+2582 LOWER ONE QUARTER BLOCK
+F0 U+2584 LOWER HALF BLOCK
+F5 U+2599 QUADRANT UPPER LEFT AND LOWER LEFT AND LOWER RIGHT
+FA U+259F QUADRANT UPPER RIGHT AND LOWER LEFT AND LOWER RIGHT
+FC U+2586 LOWER THREE QUARTERS BLOCK
+FF U+2588 FULL BLOCK
+
TIFAX
=====