From The Collaborative International Dictionary of English v.0.48 [gcide]:
Structural shape \Struc"tur*al shape\ (Engin. & Arch.) The shape of a member especially adapted to structural purposes, esp. in giving the greatest strength with the least material. Hence, Colloq., any steel or iron member of such shape, as channel irons, I beams, T beams, etc., or, sometimes, a column, girder, etc., built up with such members. [Webster 1913 Suppl.]
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