Codon is the term for the set of three adjacent bases in DNA-RNA specifying one amino acid in a protein.
For example, using the standard symbols to represent the four chemical bases in RNA, A for Adenine, G for Guanine, C for Cytosine and U for Uracil,
a sampling of the 64 codons and their respective amino acids are shown.
UUU = Phenylalanine
CCC = Proline
AAA = Lysine
GGG = Glycine
UUG = Leucine
UCU = Serine
AUG = Methionine (start codon)
UAG = (no amino acid) (stop codon)