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If the reference is to building/construction, the reader must mean "ceiling truss".
If that is the given: ceilings in residential spans (8' to 16') were customarily framed with sawn lumber, 2x6, 2x8, 2x10 and 2x12, depending on whether support for a floor above or no. With the advent of Engineered Lumber (in the mid fifties), longer spans with flatter ceilings could be achieved. Starting with Sanford Truss and Gang-Nail Systems (the first patents), wood webbed, metal gusseted trusses were used as ceiling members, eliminating intermediate bearing (span exterior wall-to-exterior wall) with no sacrifice in integrity. Later, (mid 60's) Troutner patented the Trus Joist (not really a truss (an open web member) but more than a joist). The Trus Joist had the strength of a truss, stiffness needed for long spans and the straightness desirable for flat ceilings (a truss needed to have camber). The camber was difficult to control and caused concavity.
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