Emacs, originally named EMACS, is a family of text editors that are characterized by their extensibility. Wikipedia

A family of text editors Wikipedia Disambiguation

Family of text editors Wikidata

A seminal text editor and pseudo-shell beloved by UNIX aficionados; can be used for programming tasks, simple word processing, etc. OmegaWiki

A particular visual or WYSIWYG text editor (first written by Richard Stallman in 1975 but since reimplemented by others in several distinct versions), distinguished by its use of control characters as editing commands, by its lack of distinct "insert" and "edit" modes, and by its featurefulness and extensibility. Wiktionary