thumb|300px|A rack of boards in Waikiki during a surf competition.
thumb|300px|A rack of boards in Waikiki during a surf competition.
A surfboard is a narrow plank used in surfing. Surfboards are relatively light, but are strong enough to support an individual standing on them while riding an ocean wave. They were invented in ancient Hawaii (known as papa hee nalu in Hawaiian) and were usually made of wood from local trees, such as koa. They were often over in length and extremely heavy. Major advances over the years include the addition of one or more fins (skegs) on the bottom rear of the board to improve directional stability, and numerous improvements in materials and shape.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).