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thumb|class=skin-invert-image| thumb|Books placed on an interior window sill or stool
thumb|class=skin-invert-image| thumb|Books placed on an interior window sill or stool
A windowsill (also written window sill or window-sill, and less frequently in British English, cill) is the horizontal structure or surface at the bottom of a window. Window sills serve to structurally support and hold the window in place.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).