Braille

Tactile script for the blind invented in 1824 by 15-year-old Louis Braille. Uses combinations of 6 dots (64 combinations) to represent all letters, numbers, and musical symbols. Braille lost his sight at age 9 and derived the idea from a military night communication system. Now the global standard for blind literacy education, it has expanded to Braille Bibles, Braille sheet music, and Braille mathematical notation. Digital Braille terminals now allow e-books to be read in Braille.