Conlang stands for constructed language, in contrast to natlang for "natural language". Other general terms in use for conlangs in the past, but less popular in recent years, include "artificial language" and "model language"; the latter term was popularized by Jeffrey Henning in the mid-1990s, but seems to have fallen out of general use. There are various types of conlang: * Engineered languages (engelangs [] Other terms used for describing or classifying conlangs include: These terms are used more descriptively than classificationally: