what do you mean by keys and symbols
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A chemical symbol is a notation of one or two letters representing a chemical element. Temporary element symbols are three letters that are based on the element's atomic number.
Taxonomic Key: is a device used by biologists for identifying unknown organisms. Keys are constructed so that the user is presented with a series of choices about the characteristics of the unknown organisms; by making the correct choice at each step of the key, the user is ultimately led to the identity of a specimen.
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