Ch2 - Morse code

• it is the combinination of dot and dash like binary code in computer.
• the more dash and dot, the more ability to defined the character, which the number is the power of 2(2^{number of dash and dot}). It is just like binanry number. Ch3 - Braille
• it's the sophisticated algorithm that use 6 dot emboss on the paper to reproduce the writing system.
  • It also uses the precedence(or shift code) for number, capital indicator(or escape code) to make this system a lot versatiles.