EntityQ21149167· pop 8U23Sign in to saveU23 may refer toArticle2 sectionsContentsNaval vesselsOther usesU23 may refer to== Naval vessels == , various vessels , a sloop of the Royal Navy , a submarine of the Austro-Hungarian NavyRead full article (3 paragraphs)ConnectionsCitroën U23EntityGerman submarine U-23EntitySM U-23EntityCategoriesLetter–number combination disambiguation pages