Parallel flange steel sections commonly used in construction and structural engineering. Here's a brief explanation of each:

UB (Universal Beams): Universal beams are steel beams with parallel flanges and are also known as I-beams or H-beams. They have a distinctive "I" or "H" shape and are commonly used for a wide range of structural applications, providing excellent strength and load-bearing capabilities.

UC (Universal Columns): Universal columns, also known as I-columns or H-columns, are structural steel columns with a parallel flange configuration, forming an "I" or "H" shape. They are primarily used as vertical support elements in building construction.

NPB (Narrow Parallel Flange Beams): Narrow parallel flange beams are similar to universal beams but have narrower flanges. They are used in situations where space constraints or specific load-bearing requirements exist.

WPB (Wide Parallel Flange Beams): Wide parallel flange beams, as the name suggests, have wider flanges compared to standard parallel flange beams. They are chosen for applications that require support for heavier loads.

These steel sections come in various sizes and dimensions to suit different structural needs in construction and engineering projects. The choice of section depends on factors such as the specific load requirements, space constraints, and design considerations for a particular project. 

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