The reference point usually indicated on a column about floor height is referred to as what?

The term that refers to the reference point usually indicated on a column about floor height is "Column mark." This designation is essential in construction and installation contexts, as it provides a clearly defined point that helps ensure that all floors of an escalator are level and aligned with the building structure.

Column marks serve as a guide during the installation process, allowing technicians to establish accurate placement for escalators and other vertical transportation systems. By using the column mark, workers can easily measure and verify the height of each floor and align the escalator's components with precision. This practice aids in maintaining safety standards and operational efficiency, emphasizing the importance of accurate reference points in escalator installation.