| P373 | Commons category | String | Unidentified language | ??? |
| P1889 | different from | ... | Q102036196 (Unknown Language) | Unknown Language |
| P1889 | different from | ... | Q7896964 (Unknown Language) | Unknown Language |
| P2888 | exact match | Url | http://publications.europa.eu/resource/authority/language/UND | ??? |
| P31 | instance of | ... | Q20829075 (type of language) | type of language |
| P1705 | native label | Monolingualtext | undetermined language | ??? |
| P279 | subclass of | ... | Q34770 (language) | language |
| P279 | subclass of | ... | Q17376908 (languoid) | languoid |
| P910 | topic's main category | ... | Q105668494 (Category:Unidentified language) | Category:Unidentified language |
| P424 | Wikimedia language code | String | und | ??? |
| P1014 | Art & Architecture Thesaurus ID | 300389645 |
| P13311 | Digital Scriptorium Catalog item ID | Q12714 |
| P305 | IETF language tag | und |
| P219 | ISO 639-2 code | und |
| P220 | ISO 639-3 code | und |
| P4801 | LC and MARC vocabularies ID | iso639-2/und |
| P4801 | LC and MARC vocabularies ID | languages/und |
| P9060 | POSIX locale identifier | und |
| P12187 | Thesaurus Linguae Aegyptiae thesaurus ID | RT5MKAOZGZC4ZI6NVNS6V7XVOE |
| P9753 | Wikidata language code | und |
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