What does the term "datum" refer to in print reading?

In print reading, a "datum" refers to a reference point or surface from which measurements are taken. This concept is crucial in various fields such as engineering and construction, as it establishes a baseline for dimensions and ensures accuracy in the placement and orientation of components within a design. By using a datum, professionals can mitigate discrepancies that may arise due to variations in materials or construction processes. This reference point helps maintain consistency across multiple drawings and facilitates clear communication regarding specifications and tolerances. Understanding the role of a datum is essential for accurately interpreting technical drawings and effectively executing projects.