μ (Greek small letter Mu) - should really be μm (micrometer (0.001 mm)) as it is a measure of distance. Not an approved SI unit.
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The symbol of the element is used as an abbreviation for its name.
The chemical symbol for nitrogen in the air is N2.
The chemical symbol for the element Silicon is Si. If you wanted to distinguish Silicon 29 from other Silicon isotopes you would write 29Si.
The symbol for a sulfur atom that has gained 2 electrons is represented as S^2-.
Symbol equations for reactions are written using chemical formulae.