Tibetan Braille is the braille alphabet for writing the Tibetan language. It was invented in 1992 by German socialworker Sabriye Tenberken. It is based on German braille, with some extensions from international usage. As in print, the vowel a is not written.
Despite Tibetan and Dzonkha (Bhutanese) using the same alphabet in print, Tibetan Braille differs significantly from Dzongkha Braille, which is closer to international norms.
Several consonants, wa, ya, ra, la, and sa, are provided with forms corresponding to the superscript and subscript positions in print:
as base letter
The assignments for zh and z also match international conventions, as those letters are pronounced like sh and s. Several of the assignments which do not match international braille have the values of German Braille: ⠹ch for c (ch), ⠚j for y[j], ⠵z[ts] for tsh, ⠎s[z] for z, ⠱sch[ʃ] for sh[ʃ], ⠮ß[s] for s. Letters which are not basic to the German alphabet (c, q, x, y) have been reassigned. Several of the aspirated consonants (ch, th, ph) are equivalent to the corresponding unaspirated consonant with an extra dot in the third row.
The short vowel "a" is inherent in the head (main) consonant, and is not written explicitly. When a vowel occurs at the beginning of a word, it is carried by a null consonant ཨ 〈⠁〉:
^Kronenberg, Paul. "Tibetan Braille Script". Braille without Borders.Missing or empty |url= (help);|accessdate= requires |url= (help)
^From email correspondence with Sabriye Tenberken: Single consonants are written without a "a". Only i e o and u are indicated. The order goes like this:
first the pre consonant, this could be a b, m d ' etc. Then the main consonant. After the main consonant the vowel and then the post consonant. If the main consonant has a super or a sub script, an extra letter that indicates the super script or the subscript is put before and after the main consonant. However it has to be placed before the vowel.
If you have a word with all letters possible, it looks as follows: