The term RHS stands for Rectangular Hollow Section.
SHS stands for Square Hollow Section.
Less known is the term CHS, this stands for Circular Hollow Section.
In the world of engineering and construction, the acronyms RHS, SHS and CHS are often used. This is most common in the United Kingdom and associated countries, including Australia and New Zealand.
These terms are widely used to describe mild steel; however, they can also be translated for stainless steel and aluminium engineering and construction by engineers who are familiar with the terminology.