I will be using the following resource for building a complete library of letters, numbers and characters , including shorthand and special characters for input.

The true value in using the braille keyboard, is when everything, including braille short-hand can get converted into ASCII characters ( and words) giving the most speed and throughput for the user when compared to a conventional keyboard

http://www.brailleauthority.org/ueb/symbols_list.pdf
http://www.brailleauthority.org/learn/braillebasic.pdf