queen post

In a roof truss, one of two vertical posts either side of the centre-line of the truss, from the horizontal beam near the base of the truss (tie beam or collar beam) to the rafters, and connected at the top by a second horizontal beam (strainer beam) to give a rectangular gap in the centre of the truss.

This definition is abridged from A – Z of tree terms: A companion to British arboriculture.
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