🌐EnglishEnglishDeutschFrançaisItalianoNederlandsPolskiРусский中文日本語EntityQ420986· pop 8U21U21 or U-21 may refer to:Article3 sectionsContentsNaval vesselsOther usesSee alsoU21 or U-21 may refer to:== Naval vessels == , various vessels , a sloop of the Indian Navy , a submarine of the Austro-Hungarian NavyRead full article (4 paragraphs)Available in 8 languagesFrançaisDeutsch中文日本語РусскийNederlandsPolskivia Wikidata sitelinks · CC0ConnectionsBeechcraft King AirEntityUniversitas 21OrganizationCategoriesLetter–number combination disambiguation pages