27 Mar symbol
A concrete or abstract thing used to represent another thing. Language is a symbolic process of using words (vocal or written symbols) to represent things or ideas. Barcodes and QR codes are visual symbols that are scannable by Symbol scanners. Computers are symbol manipulation systems based on two symbols, 1 and 0, representing opposites in a binary system of digital logic. The most common form of input into computers at the time of this writing is the keyboard in which each key and key combination represents a symbol (letter, number or Mark). Even speech systems are currently based on converting the sound waves generated by speech into letters, numbers and marks.