Ribosomal DNA, or ribosomal deoxyribonucleic acid (rDNA), is the DNA that encodes ribosomal proteins that form ribosomes
https://dnascience.plos.org/2019/03/28/a-new-biological-aging-clock-ribosomal-dna/
https://pubmed.ncbi.nlm.nih.gov/30604343/
https://sciencing.com/difference-between-ribosome-ribosomal-dna-8712764.html
That’s about kkke saying blue eyes DNA is the DNA that forms blue eyes. The point is there is no particular actual mechanism like mRNA or tRNA.