柵
さく · saku · JLPT N3 · noun
fence
🪵 柵 = 木 wood + 冊 slats tied in a row: a wooden fence
冊 started as a drawing of bamboo strips tied together, which is how early books were bound. Add 木 (wood) and the slats turn into stakes lashed side by side: a paling fence. For the reading saku, think of how a fence sacks off a field.