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Wiktionary
queen post

n. A supporting post designed to span longer openings than a king post.

WordNet
queen post

n. vertical tie post in a roof truss

Wikipedia
Queen post

A queen post is a tension member in a truss that can span longer openings than a king post truss. A king post uses one central supporting post, whereas the queen post truss uses two. Even though it is a tension member, rather than a compression member, they are commonly still called a post. A queen post is often confused with a queen strut, one of two compression members in roof framing which do not form a truss in the engineering sense.