Letter is one of the important tools. Do not minded that the letter is a communication tool that is ancient. You must know today the letter still has a very important role, for example if you want to apply for a job, or the company will communicate business with other companies. Well for that on this occasion we will give an example The Most Brilliant and also Interesting Amino Acid Single Letter Codes. On top of existing examples and below we provide many more examples of other letters. Hope this is useful to you.