Angle sections, also known as "L" sections, are structures with two perpendicular sides that are widely used to construct roof trusses and decks with infill beams.
Types of Angle Sections:

Equal Angles:
Both sides are of equal length. Used where equal strength is required in both axes.  Sizes range from 20 mm x 20 mm x 3 mm to 200 mm x 200 mm x 25 mm. Weight per linear metre ranges from 9 N/m to 736 N/m. Unequal Angles:

Sides are of different sizes.
Used where different load distributions are required.Sizes range from 30 mm x 20 mm x 3 mm to 200 mm x 150 mm x 18 mm. Weight per linear metre - from 11 N/m to 469 N/m. These profiles are valued in construction for their high strength-to-weight ratio and ease of installation.