A DNA or RNA molecule that codes for a particular amino acid through a group of three successive nucleotides is called a triplet codon.
Some codons serve as translational start or stop signals.
A single amino acid is determined by the triplet code, which consists of three nucleotides.
A triplet code would be the smallest set of four bases capable of encoding all 20 amino acids.
In other terms, it is a specific set of three consecutive nucleotides that functions as a part of the genetic code and specifies a certain amino acid in a protein or initiates or terminates protein synthesis.