There are many associations for trna floating around in the the binary sea that is the internet. The trna is a macro molecule that specifies that a given mrna codon is translated into a specific amino acid. Literally it is a linking molecule that contains a particular activated amino acid on 1 end and specific RNA sequence on the other. TRNAs span 2 molecular worlds. The world of macromolecules made of nucleotides with the world of macro molecules made of amino acids.