Thwart
Encyclopedia
A thwart is a strut placed crosswise (left/right) in a ship or boat, to brace it crosswise.

In rowboats it can also serve as a seat for a rower.

Some inflatable boat
Inflatable boat
An inflatable boat is a lightweight boat constructed with its sides and bow made of flexible tubes containing pressurised gas. For smaller boats, the floor and hull beneath it is often flexible. On boats longer than , the floor often consists of three to five rigid plywood or aluminium sheets fixed...

s have a thwart which can be folded and removed so the boat can be deflated and rolled up for transport or storage.
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