This proposal has been rejected. This decision was taken by the language committee in accordance with the Language proposal policy based on the discussion on this page.
A committee member provided the following comment:
Braille is not a language, but a writing system for languages. Unlike the Sign languages, Braille could be relatively easily transliterated from particular written language. I suggest creating an initiative to make Braille accessible on regular Wikimedia projects pages; for example Wikipedia in Braille. --Millosh (talk) 13:00, 20 January 2017 (UTC)Reply[reply]
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Braille is not a language, it's a script which can be used to write many languages. It's not clear to me how useful it would be (I would expect people who use braille to be using a screen reader connected to braille display which can already convert their language to braille), but if there is a good reason to add braille output, then it should be done as part of existing Wikipedias. - Nikki (talk) 15:31, 5 December 2016 (UTC)Reply[reply]
Oppose too, per above, we should start a Braille wiki at wikia: instead of using WMF instance, and as far as I know it's unlikely that sil can approve a code for Braille. --Liuxinyu970226 (talk) 07:07, 2 January 2017 (UTC)Reply[reply]
Comment ISO 15924 gives a code for Braille. en-Brai woud mean English written in Braille orthography. Evertype (talk) 20:16, 20 January 2017 (UTC)Reply[reply]