res

Res is a term with several distinct meanings across languages and fields. It most often appears in Latin, where res means “thing,” “matter,” or “affair.” It is a feminine noun of the fifth declension and appears in a range of classical and legal phrases, such as res publica (the public thing, i.e., the state) and res ipsa loquitur (the thing speaks for itself). In English, res survives mostly in these phrases and in scholarly writing as a general reference to a thing or matter under discussion.

In computing and technology, res commonly denotes a collection of resources. In Android software development, the res directory holds app resources such as layouts, strings, images, and other non-code assets. In statistics and data analysis, res or resid is frequently used as a variable name for residuals—the differences between observed and predicted values—often produced by a residuals function in statistical software.

In energy policy and related engineering fields, RES stands for Renewable Energy Sources. It is used to describe, assess, or regulate sources such as wind, solar, hydro, and biomass within national or regional energy frameworks. The term features prominently in policy documents, directives, and market mechanisms aimed at increasing the share of renewable energy in the energy mix.

As an acronym, RES can designate various organizations, programs, or concepts depending on the context. The common thread is that it serves as a concise label for a thing, resource, or category, whether in law, computing, engineering, or policy.