Keel

The fin-like structure below a boat that provides stability and resists leeway.

How to sign

Use Dominant vertical flat-B, fingers together, edge-first. The base or passive hand is Non-dominant horizontal flat-B, palm down: hull. Set the hull base. Place the dominant hand at the center underside of the hull. Move straight downward, edge-first, in one fixed vertical stroke. Hold the vertical flat-B directly below the hull as the underwater fin. Set a horizontal flat-B hand as the hull. From its center, move the dominant flat-B vertically downward, edge-first, to show the fixed underwater fin.