Morse Code is a communication method which represent the letters of alphabet using long and short pulses of light or sound. Each character is represented by a unique sequence of dots and dashes. It is named after its inventor Samuel F.B. Morse who was born in the 1840s. The most famous code is that of SOS •••–––••• which is the internationally recognised emergency signal. There is much debate about the origins of the term SOS, it could mean “save our souls” or “save our ships”. Historically it is believed the SOS signal comes from the fact that it is easily recognisable, 3 short dots followed by 3 long dashes then 3 short dots. The rhythmic pattern makes it easily recognised.
Braille is a tactile writing system which enables visually impaired or blind people to read and write. This system was invented by Louis Braille a French educator at the beginning of the nineteenth century.
Each letter is shown in a rectangular cell by a cluster of raised dots that can be felt with the finger tips. Each cell representsa letter, numeral or punctuation mark.