PRj

Prj is a short form that can refer to several different concepts across domains, with the most widely recognized use in geospatial data. In that context, prj commonly denotes the file extension .prj, which is part of a shapefile set used in geographic information systems (GIS). A .prj file contains a textual description of the coordinate reference system used by the associated spatial data, typically written in Well-Known Text (WKT) format. Software reading shapefiles relies on this file to correctly align coordinates with real-world locations, ensuring that maps and analyses reflect real geographic positions.

As a general abbreviation, prj is also used informally as shorthand for “project.” In everyday documentation, naming conventions, or code and file management workflows, prj may appear as a folder name, file prefix, or variable to indicate project-related content. This usage is not standardized and varies by organization or context.

In addition to GIS and generic project usage, prj can appear in other specialized contexts as an acronym or label, but those meanings are typically defined locally. Because the interpretation of prj depends on the setting, it is useful to rely on surrounding documentation to determine whether prj refers to a projection file, a project label, or another conception within a specific system.