Binary code practical applications such as computers, electric circuits, and more. The bit string is not the only type of binary code. A binary system, in general, is any system that allows only two choices such as a switch in an electronic system or a simple true or false test. Braille is a type of binary code that is widely used by the blind to read and write by touch, named for its creator, Louis Braille. This system consists of grids of six dots each, three per column, in which each dot has two states: raised or not raised. The different combinations
Slate and stylus Children) the first book ever published for the blind. Prior to 1786 tools for the blind to read or write were the results of individuals personal approaches to solutions. One of the more notable approach was that of Nicholas Saunderson (Lucasian Professor of Mathematics at Cambridge) blind nearly from birth, devised an Arithmetical slate. Braille evolved from the night writing of Charles Barbier. "Ecriture Nocturne" (night writing) was invented in response to Napoleon's demand for a code that soldiers could use to communicate silently and without light at night. Because it used a cell with 2 columns of six dots