Language codes (3 letters) Abbreviations and Acronyms
- UAEUnited Arab Eremites
- UDUndetermined
- UDUUduk: a language of Ethiopia
- UGAUgaritic
- UIGUighur
- UKGUkuriguma
- UKRUkrainian Language (ISO 639-2 Code)
- ULAFUNGWA: A Language of Nigeria
- ULKMERIAM: A Language of Australia
- UMBUmbundu
- UNDUndetermined
- UNDETUndetermined
- UNDETMUndetermined
- URDUrdu Language (ISO 639-2 Code)
- UZBUzbek Language (ISO 639-2 Code)
- VAIVail
- VAYWayu
- VIEVietnamese Language (ISO 639-2 Code)
- VKAPama-Nyungan - KARIYARRA
- VKPKorlai Creole Portuguese
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