What does the term 'datum' refer to in technical drawings?

The term 'datum' in technical drawings refers to a dimensional reference point that serves as a basis for measuring and describing the geometry of a part. It is essential in ensuring consistency and accuracy when creating technical drawings, as it provides a standardized origin from which measurements can be taken. This helps in defining the relationships between different features of the design, ensuring that parts can be manufactured to precise specifications. By establishing a common reference, datums aid in the interpretation and communication of design intent, which is critical for manufacturing and quality control processes.