Answer:
Special-sense codons
Step-by-step explanation:
The 3 triplets UAA, UAG, UGA do not code for any amino acid. They were originally described as non-sense codons, as against the 61 codons, which are termed as sense codons.
However, since the 3 triplets UAA, UAG, UGA help to signal the natural end of translation of a peptidyl chain, they are more appropriately called Special-sense codons