L-beam

noun
1.
an iron or steel bar, brace, or cleat in the form of an angle.
2.
Also called angle, angle bar, L bar, L beam. a piece of structural iron or steel having a cross section in the form of an L .
noun
1.
(def 2).
noun
1.
Also called angle, angle bar. an iron or a steel structural bar that has an L-shaped cross section
2.
any piece of iron or steel forming an angle, esp a right angle