UFO (Unidentified Flying Object)

UFO (abbreviation, Unidentified Flying Object) is the most commonly used term in English for aerial phenomenon of unknown origin.

UFO

 * German: Unidentifiziertes Flugobjekt
 * Danish: Uidentificeret Flyvende Objekt

OVNI

 * French: Objet Volant Non-Identifié
 * Italian: Oggetto Volante Non Identificato
 * Spanish: Objeto Volador No Identificado
 * Portuguese: Objecto Voador Não Identificado

OVV

 * Dutch: Ongeïdentificeerd Vliegend Voorwerp

НЛО

 * Russian: Неопо́знанный Лета́ющий Объе́кт