Braille On Folding Cartons

In 1825, frenchman louis braille 18091852 invented a reading system for the blind through which the alphabet, numbers, and punctuation marks were represented in a tangible form via a series of raised dots. The braille system established itself internationally, and is now in use in all languages. While a to z is standardised, there are, of course, special characters, which are unique to local languages.