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14 - Back-cap cross-piece / post cap
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In a piano, the post cap is a decorative piece of wood that is used to cover the top of the (back) posts. The (back) posts are vertical supports that help to hold the shape of the piano and provide a stable base for the other structural components of the instrument. The post caps are typically made of a hardwood such as maple or beech and are located at the top of the posts, behind the soundboard. They are used to cover the tops of the posts and add a decorative touch to the piano. The post caps may also serve a structural function by helping to distribute the weight of the strings and other components evenly across the posts and protecting the tops of the posts from damage. They are an important part of the piano's structure and contribute to the overall appearance of the instrument.
