You can download and print this braille D20
Table-top role playing games traditionally involve a pencil, paper, and the insatiable tactical experience of rolling dice. Unfortunately for some, reading the results of dice can be difficult. Even more so for the visually impaired.
Now available on Thingiverse is a 3d-printable model by idellwig. This model file features a D20 with braille on each side. Of course, all the other polyhedral dice are available from the same author to complete your set and gaming experience.