What letter represents the word "thickness" in the code book?

In the context of the Structural Welding Code – Steel (D1.1), the letter representing the word "thickness" is indeed "T." This designation is critical in welding specifications because it helps to clearly communicate the specific measurements that must be adhered to in welding projects. Understanding these abbreviations is essential for welders, engineers, and fabricators alike, as they ensure clarity and consistency in the documentation of materials and processes.

Using "T" for thickness aligns with the conventions typically used in engineering and design documents, where letters are often chosen to represent key attributes of structures and components. Knowing this notation can help professionals interpret drawings and specifications accurately, which is vital for compliance with the standards laid out in the code.