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The ISO 639 standard defines two-letter codes for many languages, and
three-letter codes for more rarely used languages.
All abbreviations for languages used in the Translation Project should
come from this standard.
For the commonly used languages, the ISO 639-1 standard defines two-letter
codes.
- ‘aa’
 - 
Afar.
 - ‘ab’
 - 
Abkhazian.
 - ‘ad’
 - 
Adangme.
 - ‘ae’
 - 
Avestan.
 - ‘af’
 - 
Afrikaans.
 - ‘ak’
 - 
Akan.
 - ‘am’
 - 
Amharic.
 - ‘an’
 - 
Aragonese.
 - ‘ar’
 - 
Arabic.
 - ‘as’
 - 
Assamese.
 - ‘av’
 - 
Avaric.
 - ‘ay’
 - 
Aymara.
 - ‘az’
 - 
Azerbaijani.
 - ‘ba’
 - 
Bashkir.
 - ‘be’
 - 
Byelorussian; Belarusian.
 - ‘bg’
 - 
Bulgarian.
 - ‘bh’
 - 
Bihari.
 - ‘bi’
 - 
Bislama.
 - ‘bm’
 - 
Bambara.
 - ‘bn’
 - 
Bengali; Bangla.
 - ‘bo’
 - 
Tibetan.
 - ‘br’
 - 
Breton.
 - ‘bs’
 - 
Bosnian.
 - ‘ca’
 - 
Catalan.
 - ‘ce’
 - 
Chechen.
 - ‘ch’
 - 
Chamorro.
 - ‘co’
 - 
Corsican.
 - ‘cr’
 - 
Cree.
 - ‘cs’
 - 
Czech.
 - ‘cu’
 - 
Church Slavic.
 - ‘cv’
 - 
Chuvash.
 - ‘cy’
 - 
Welsh.
 - ‘da’
 - 
Danish.
 - ‘de’
 - 
German.
 - ‘dv’
 - 
Divehi; Maldivian.
 - ‘dz’
 - 
Dzongkha; Bhutani.
 - ‘ee’
 - 
'Ew'e.
 - ‘el’
 - 
Greek.
 - ‘en’
 - 
English.
 - ‘eo’
 - 
Esperanto.
 - ‘es’
 - 
Spanish.
 - ‘et’
 - 
Estonian.
 - ‘eu’
 - 
Basque.
 - ‘fa’
 - 
Persian.
 - ‘ff’
 - 
Fulah.
 - ‘fi’
 - 
Finnish.
 - ‘fj’
 - 
Fijian; Fiji.
 - ‘fo’
 - 
Faroese.
 - ‘fr’
 - 
French.
 - ‘fy’
 - 
Western Frisian.
 - ‘ga’
 - 
Irish.
 - ‘gd’
 - 
Scots; Gaelic.
 - ‘gl’
 - 
Galician.
 - ‘gn’
 - 
Guarani.
 - ‘gu’
 - 
Gujarati.
 - ‘gv’
 - 
Manx.
 - ‘ha’
 - 
Hausa.
 - ‘he’
 - 
Hebrew (formerly iw).
 - ‘hi’
 - 
Hindi.
 - ‘ho’
 - 
Hiri Motu.
 - ‘hr’
 - 
Croatian.
 - ‘ht’
 - 
Haitian; Haitian Creole.
 - ‘hu’
 - 
Hungarian.
 - ‘hy’
 - 
Armenian.
 - ‘hz’
 - 
Herero.
 - ‘ia’
 - 
Interlingua.
 - ‘id’
 - 
Indonesian (formerly in).
 - ‘ie’
 - 
Interlingue.
 - ‘ig’
 - 
Igbo.
 - ‘ii’
 - 
Sichuan Yi.
 - ‘ik’
 - 
Inupiak; Inupiaq.
 - ‘io’
 - 
Ido.
 - ‘is’
 - 
Icelandic.
 - ‘it’
 - 
Italian.
 - ‘iu’
 - 
Inuktitut.
 - ‘ja’
 - 
Japanese.
 - ‘jv’
 - 
Javanese.
 - ‘ka’
 - 
Georgian.
 - ‘kg’
 - 
Kongo.
 - ‘ki’
 - 
Kikuyu; Gikuyu.
 - ‘kj’
 - 
Kuanyama; Kwanyama.
 - ‘kk’
 - 
Kazakh.
 - ‘kl’
 - 
Kalaallisut; Greenlandic.
 - ‘km’
 - 
Khmer; Cambodian.
 - ‘kn’
 - 
Kannada.
 - ‘ko’
 - 
Korean.
 - ‘kr’
 - 
Kanuri.
 - ‘ks’
 - 
Kashmiri.
 - ‘ku’
 - 
Kurdish.
 - ‘kv’
 - 
Komi.
 - ‘kw’
 - 
Cornish.
 - ‘ky’
 - 
Kirghiz.
 - ‘la’
 - 
Latin.
 - ‘lb’
 - 
Letzeburgesch; Luxembourgish.
 - ‘lg’
 - 
Ganda.
 - ‘li’
 - 
Limburgish; Limburger; Limburgan.
 - ‘ln’
 - 
Lingala.
 - ‘lo’
 - 
Lao; Laotian.
 - ‘lt’
 - 
Lithuanian.
 - ‘lu’
 - 
Luba-Katanga.
 - ‘lv’
 - 
Latvian; Lettish.
 - ‘mg’
 - 
Malagasy.
 - ‘mh’
 - 
Marshallese.
 - ‘mi’
 - 
Maori.
 - ‘mk’
 - 
Macedonian.
 - ‘ml’
 - 
Malayalam.
 - ‘mn’
 - 
Mongolian.
 - ‘mo’
 - 
Moldavian.
 - ‘mr’
 - 
Marathi.
 - ‘ms’
 - 
Malay.
 - ‘mt’
 - 
Maltese.
 - ‘my’
 - 
Burmese.
 - ‘na’
 - 
Nauru.
 - ‘nb’
 - 
Norwegian Bokmål.
 - ‘nd’
 - 
Ndebele, North.
 - ‘ne’
 - 
Nepali.
 - ‘ng’
 - 
Ndonga.
 - ‘nl’
 - 
Dutch.
 - ‘nn’
 - 
Norwegian Nynorsk.
 - ‘no’
 - 
Norwegian.
 - ‘nr’
 - 
Ndebele, South.
 - ‘nv’
 - 
Navajo; Navaho.
 - ‘ny’
 - 
Chichewa; Nyanja.
 - ‘oc’
 - 
Occitan; Provençal.
 - ‘oj’
 - 
Ojibwa.
 - ‘om’
 - 
(Afan) Oromo.
 - ‘or’
 - 
Oriya.
 - ‘os’
 - 
Ossetian; Ossetic.
 - ‘pa’
 - 
Panjabi; Punjabi.
 - ‘pi’
 - 
Pali.
 - ‘pl’
 - 
Polish.
 - ‘ps’
 - 
Pashto, Pushto.
 - ‘pt’
 - 
Portuguese.
 - ‘qu’
 - 
Quechua.
 - ‘rm’
 - 
Rhaeto-Romance.
 - ‘rn’
 - 
Rundi; Kirundi.
 - ‘ro’
 - 
Romanian.
 - ‘ru’
 - 
Russian.
 - ‘rw’
 - 
Kinyarwanda.
 - ‘sa’
 - 
Sanskrit.
 - ‘sc’
 - 
Sardinian.
 - ‘sd’
 - 
Sindhi.
 - ‘se’
 - 
Northern Sami.
 - ‘sg’
 - 
Sango; Sangro.
 - ‘si’
 - 
Sinhala; Sinhalese.
 - ‘sk’
 - 
Slovak.
 - ‘sl’
 - 
Slovenian.
 - ‘sm’
 - 
Samoan.
 - ‘sn’
 - 
Shona.
 - ‘so’
 - 
Somali.
 - ‘sq’
 - 
Albanian.
 - ‘sr’
 - 
Serbian.
 - ‘ss’
 - 
Swati; Siswati.
 - ‘st’
 - 
Sesotho; Sotho, Southern.
 - ‘su’
 - 
Sundanese.
 - ‘sv’
 - 
Swedish.
 - ‘sw’
 - 
Swahili.
 - ‘ta’
 - 
Tamil.
 - ‘te’
 - 
Telugu.
 - ‘tg’
 - 
Tajik.
 - ‘th’
 - 
Thai.
 - ‘ti’
 - 
Tigrinya.
 - ‘tk’
 - 
Turkmen.
 - ‘tl’
 - 
Tagalog.
 - ‘tn’
 - 
Tswana; Setswana.
 - ‘to’
 - 
Tonga.
 - ‘tr’
 - 
Turkish.
 - ‘ts’
 - 
Tsonga.
 - ‘tt’
 - 
Tatar.
 - ‘tw’
 - 
Twi.
 - ‘ty’
 - 
Tahitian.
 - ‘ug’
 - 
Uighur.
 - ‘uk’
 - 
Ukrainian.
 - ‘ur’
 - 
Urdu.
 - ‘uz’
 - 
Uzbek.
 - ‘ve’
 - 
Venda.
 - ‘vi’
 - 
Vietnamese.
 - ‘vo’
 - 
Volapük; Volapuk.
 - ‘wa’
 - 
Walloon.
 - ‘wo’
 - 
Wolof.
 - ‘xh’
 - 
Xhosa.
 - ‘yi’
 - 
Yiddish (formerly ji).
 - ‘yo’
 - 
Yoruba.
 - ‘za’
 - 
Zhuang.
 - ‘zh’
 - 
Chinese.
 - ‘zu’
 - 
Zulu.
 
For rarely used languages, the ISO 639-2 standard defines three-letter
codes.  Here is the current list, reduced to only living languages with at least
one million of speakers.
- ‘ace’
 - 
Achinese.
 - ‘awa’
 - 
Awadhi.
 - ‘bad’
 - 
Banda.
 - ‘bal’
 - 
Baluchi.
 - ‘ban’
 - 
Balinese.
 - ‘bem’
 - 
Bemba.
 - ‘bho’
 - 
Bhojpuri.
 - ‘bik’
 - 
Bikol.
 - ‘bin’
 - 
Bini.
 - ‘btk’
 - 
Batak (Indonesia).
 - ‘bug’
 - 
Buginese.
 - ‘ceb’
 - 
Cebuano.
 - ‘din’
 - 
Dinka.
 - ‘doi’
 - 
Dogri.
 - ‘fil’
 - 
Filipino; Pilipino.
 - ‘fon’
 - 
Fon.
 - ‘gon’
 - 
Gondi.
 - ‘gsw’
 - 
Alemani; Swiss German.
 - ‘hil’
 - 
Hiligaynon.
 - ‘hmn’
 - 
Hmong.
 - ‘ilo’
 - 
Iloko.
 - ‘kab’
 - 
Kabyle.
 - ‘kam’
 - 
Kamba.
 - ‘kbd’
 - 
Kabardian.
 - ‘kmb’
 - 
Kimbundu.
 - ‘kok’
 - 
Konkani.
 - ‘kru’
 - 
Kurukh.
 - ‘lua’
 - 
Luba-Lulua.
 - ‘luo’
 - 
Luo (Kenya and Tanzania).
 - ‘mad’
 - 
Madurese.
 - ‘mag’
 - 
Magahi.
 - ‘mai’
 - 
Maithili.
 - ‘mak’
 - 
Makasar.
 - ‘man’
 - 
Mandingo.
 - ‘men’
 - 
Mende.
 - ‘min’
 - 
Minangkabau.
 - ‘mni’
 - 
Manipuri.
 - ‘mos’
 - 
Mossi.
 - ‘mwr’
 - 
Marwari.
 - ‘nap’
 - 
Neapolitan.
 - ‘nso’
 - 
Pedi; Sepedi; Northern Sotho.
 - ‘nym’
 - 
Nyamwezi.
 - ‘nyn’
 - 
Nyankole.
 - ‘pag’
 - 
Pangasinan.
 - ‘pam’
 - 
Pampanga.
 - ‘raj’
 - 
Rajasthani.
 - ‘sas’
 - 
Sasak.
 - ‘sat’
 - 
Santali.
 - ‘scn’
 - 
Sicilian.
 - ‘shn’
 - 
Shan.
 - ‘sid’
 - 
Sidamo.
 - ‘srr’
 - 
Serer.
 - ‘suk’
 - 
Sukuma.
 - ‘sus’
 - 
Susu.
 - ‘tem’
 - 
Timne.
 - ‘tiv’
 - 
Tiv.
 - ‘tum’
 - 
Tumbuka.
 - ‘umb’
 - 
Umbundu.
 - ‘wal’
 - 
Walamo.
 - ‘war’
 - 
Waray.
 - ‘yao’
 - 
Yao.
 
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