Treenail

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Pronounced "trunnel" (rhymes with "tunnel"), a treenail, trenail, or trunnel is a wood peg, or dowel used to fasten two wood boards or beams together, especially in timber frame construction and wooden shipbuilding. It is an ancient technology. Covered bridges in the U.S. often use treenails as fasteners. Many such bridges are still in use.

Ancient Shipbuilding used treenails to bind the boat together.