ISO 1101 is an international standard that specifies the rules for geometric dimensioning and tolerancing (GD&T) on technical drawings. It provides a clear and consistent way to communicate the allowable variations in the size, shape, and location of features on a part, ensuring that everyone involved in the manufacturing and inspection processes understands the design intent. The standard outlines symbols and terminology used to define geometric characteristics, such as flatness, cylindricity, and profile. By adhering to ISO 1101, manufacturers can improve product quality, reduce errors, and enhance collaboration across different teams and industries.