What type of numbers are shown in the upper right corners of most sheets?

The numbers shown in the upper right corners of most sheets are typically referred to as sheet numbers. These numbers serve a crucial purpose in organizing and referencing the various drawings and documents within a set of construction plans. Sheet numbers help users quickly locate specific pages in a large set of plans by providing a unique identifier for each sheet. This organization is vital in ensuring that everyone involved in a project can communicate effectively about particular components of the plans, such as structural details, site layouts, or utility locations.

In contrast, project numbers usually refer to a unique identifier assigned to the entire project rather than individual sheets. Plan numbers may denote specific types of plans or standards but are not the standard identifiers for the sheets themselves. Index numbers often serve as references within an indexing system or to indicate the position of the sheet within a broader documentation strategy but do not hold the same role as sheet numbers in the context of individual sheets.