Navajo Braille

Navajo Braille is the braille alphabet of the Navajo language. It uses a subset of the letters of Unified English Braille, along with the punctuation and formatting of that standard. There are no contractions. 
Additional letters, beyond those of English braille, are for ł, for ' (glottal stop and ejective consonants), the French vowels with grave accents for the Navajo vowels with acute accents (high tone), and for ogonek on the following vowel (nasal vowels, e.g. for ą, for ą́). is only used for the digit 6, as the letter 'f' does not exist in the Navajo alphabet. 
In numerical order by decade, the letters are:
The alphabet was created by Carol Begay Green and adopted by the Navajo Nation in 2015.