The acronym UNB does not exist in ITS-Arolsen neither in Abbreviations (which are mostly from German language), nor in Glossary.
That code is in Polish line about the place of birth:
miejsce urodzenia (państwo) UNB
Unknown in English
Unbekannt in German
Guessing indicates rather 3 letters from German than English.
Anyway it is unbekkant/unknown/nieznany in their archives, as the international coding systems for countries or passeports were not existing yet at that time.
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