Rashi’s hat: Rashi and other rishonim describe the top of a ruminant trachea as the “shipui kova, sitting “like a hat on the siman, a roughly pentagonal structure and surely not black. In a better connection, in Hullin 48b, Rashi explains the bais hakosos as “at the end of the stomach, looking like a hat”. I will have to check on that in Sichos Hullin, but I am fairly certain it is not shaped quite like a fedora.
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