氷棚 （ヒョウホウ） ice shelf

陸棚 （リクダナ） continental shelf

棚 （たな） shelf, ledge, rack, trellis

棚上げ （たなあげ） shelving (a matter, plan, etc.), pigeonholing, tabling, putting aside, putting on hold, keeping (goods) off the market (to adjust the supply-demand balance)