Sunoko

It means a duckboard which is a platform made of wooden slats. It’s like a pallet that forklift truck drivers often use. The partially opened duckboard can allow air to pass through easily, so it is placed on the bottom of the shelf of an oshi-ire for moisture protection, when you put away folded futons in it. It can be placed on the wooden floor when you lay out futons on the floor.