Refers to a shelf board or shelving in general, often used in contexts like furniture, storage, or construction.
The shelf board of the bookcase is starting to sag.
board of a ship's planking
Dated nautical term for a plank used in traditional Japanese shipbuilding. Rare in modern usage.
棚板を追加して収納スペースを増やした。
I added extra shelving to increase storage space.
The planking boards of old Japanese ships were made of thick cedar planks.