🌐EnglishEnglishDeutschEspañolPolskiPortuguêsРусскийفارسی中文日本語EntityQ910691· pop 9· linked from 179 articlesrigid designatorterm with invariant possible designationsAvailable in 9 languagesEspañolDeutsch日本語РусскийPortuguêsEstonianPolskiفارسیvia Wikidata sitelinks · CC0Connectionspossible worldEntityCausal theory of referenceEntityCategoriesFormal semantics (natural language)Philosophy of languagePossible world