A Symbol represents an
process or a
physical Entity. Symbols are there to communicate Meaning. Characters represent the letters in the alphabet and numerals are symbols of numbers. Symbols can represent multiple entities. 4 Letters ACGT are used to to symbolize the four nucleotides of the genetic code, while 20 letters (including the 4 mentioned before) are used the represent individual amino acids. Several Symbols can represent the same meaning too. For example, amino acids can also be symbolized by a three letter code or by their trivial or chemical names.