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
Writing system are able to represent all that may be expressed in the spoken language, while a "partial" writing system is limited in what it can convey. Writing systems can be independent from languages, one can have multiple writing systems for a language, e.g., Hindi and Urdu; and one can also have one writing system for multiple languages, e.g., the Arabic script. Chinese characters were also borrowed by variant countries as their early writing systems, e.g., the early writing systems of Vietnamese language until the beginning of the 20th century. To represent a conceptual system, one uses one or more languages, e.g.,