The software bundle was later renamed ZetaLisp, to distinguish the Symbolics' product from other vendors who had also licensed the MIT software. Symbolics' Zmacs text editor, a variant of Emacs, was implemented in a text-processing package named ZWEI, an acronym for Zwei was Eine initially, with Eine being an acronym for Eine Is Not Emacs. Both are recursive acronyms and puns on the German words for one (eins, eine) and two (zwei).
The software bundle was later renamed ZetaLisp to distinguish the Symbolics' product from other vendors who had also licensed the MIT software Symbolics' Zmacs text editor, a variant of Emacs, was implemented in a text-processing package named ZWEI, an acronym for Zwei was Eine initially, with Eine being an acronym for Eine Is Not Emacs Both are recursive acronyms and puns on the German words for one (eins, eine) and two (zwei).