What letter symbolizes the word 'thickness' in the welding code book?

In the context of the welding code book, the letter that symbolizes 'thickness' is 'T'. This designation is used consistently across various sections of the welding code to refer to the thickness of materials being welded or inspected. The use of standardized symbols and abbreviations like this helps ensure clarity and uniform understanding among professionals in the field. It streamlines communication regarding specific dimensions, making it easier for engineers, welders, and inspectors to interpret and apply the code effectively without ambiguity. Understanding these symbols is crucial in adhering to requirements and specifications set forth in the welding code, ensuring that work meets safety and quality standards.