“Shelf / Ledge / Rack / Mount” in Japanese is 棚, read hou, tana, dana (ほう, たな, -だな). It is a Jōyō kanji taught in Japanese secondary school (junior & senior high) — the 高手 · Master tier beyond the grade 1–6 Kyōiku set, and appears in words such as 本棚 (bookshelf).
What does 棚 mean?
Same sound, different character — the classic trap. Compare them side by side: