The Arm Length of T Shape is the length of any of the two arms of the T Shape which are actually the left and right wings of the T Shape form when the vertical shaft joins the upper beam. And is denoted by lArm. Arm Length of T Shape is usually measured using the Meter for Length. Note that the value of Arm Length of T Shape is always positive. Typically, the value of Arm Length of T Shape is greater than 0.