What is CL-2? (or CL-rated?)?

I'm doing some research on audio cables, and I keep coming across the term "CL-2", or "CL-rated". I also tend to stumble upon the term "category 1/2". I can kinda see that CL-2 and CL-rated are related terms, but I don't know if that "category 1/2" applies to audio cables or snakes.

Help please?

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