If you are talking about salt crystals, you are incorrect, as they are not a coded system. It's repetetive and structural, but not coded. If it is coded, could you please tell me what the codes are, and what external system this codes for?
I'm talking about cadmium iodide, whose many structures are repetitive on a long repeat, just like DNA. They carry binary information about the ordering of layers in the crystal.
If it is coded, could you please tell me what the codes are, and what external system this codes for?
What 'external system' does RNA code for?