Figure 7-1.—Symbols for single structural shapesa beam or column when used alone. But the channelsmay be assembled together with other structural shapesand connected by rivets or welds to form efficientbuilt-up members.ANGLES—The cross section of an angle resemblesthe letter L. Angles are identified by the dimensions ininches of their legs, as L 7 x 4 x 1/2. Dimensions ofstructural angles are measured in inches along theoutside or backs of the legs; the dimension of the widerleg is given first (7 in the example). The third dimensionis the thickness of the legs; both legs always have equalthickness.Angles may be used singly or incombinations of two or four angles to form members.Angles also are used to connect main members or partsof members together.TEES—A structural tee is made by slitting astandard I- or H- beam through the center of its web,thus forming two T-shapes from each beam. Indimensioning, the structural tee symbol is preceded bythe letters ST. For example, the symbol ST 5 WF 10.5means the tee has a nominal depth of 5 inches, a wideflange, and weighs 10.5 pounds per linear foot. A rolledtee is a manufactured shape. In dimensioning, the rolledtee symbol is preceded by the letter T. The dimensionT 4 x 3 x 9.2 means the rolled T has a 4-inch flange, anominal depth of 3 inches, and a weight of 9.2 poundsper linear foot.7-2