Variants of a mold are catalogued separately, so each one has its own sets and minifigs. Check these too if something you expect is missing here.

• 3009apr0036 Brick 1 x 6 with 'TAXI' Thick Print this part is a alternate of it
• 3009a Brick 1 x 6 without Bottom Tubes, with 2 Raised Cross Supports this part is a print of it