Symbols on manufacturing drawings are graphical representations used to convey technical details about parts, materials, processes, or geometric characteristics in a simplified and standardized manner. Common symbols include those for welding, surface finish, threading, and material specifications, as well as geometric dimensioning and tolerancing (GD&T) symbols. These symbols ensure that engineers, manufacturers, and quality inspectors can easily interpret the design intent without ambiguity. For example, a symbol for surface finish will specify the required roughness for a part’s surface, ensuring it performs as intended. Using symbols streamlines communication, reduces errors, and ensures consistency across all stages of manufacturing and assembly.