What letter is commonly used to designate structural drawings?

In architectural and engineering practices, the letter "S" is commonly used to designate structural drawings. Structural drawings are essential as they detail the components that make up a building's structure, including beams, columns, and framing systems. The "S" designation helps differentiate these drawings from other types, such as mechanical, electrical, or architectural drawings, which are designated by other letters.

For example, "A" typically represents architectural drawings, while "M" might be used for mechanical. This standardized system of designating drawings is important for clarity and communication among various teams involved in the construction process. Using "S" specifically allows architects, engineers, and construction workers to easily identify which set of drawings pertains to the structural elements of a project, ensuring that everyone is on the same page during both planning and construction phases.