There isn't a universally recognized symbol specifically for 'non existent'. However, a common way to denote lack of existence or absence is to use an empty set symbol (∅) in mathematics or a blank space in text.
When you see a COOH group in a formula it usually mean that you have an organic acid. for instance HCOOH is Formic Acid and CH3COOH is Acetic Acid.
There is no chemical with the formula N4HO. It appears to be a non-existent or incorrect formula.
If a GPS system is leading you to non-existent addresses, one should definitely have the system updated. These GPS devices are very accurate now, but do remind owners of the need to upgrade every so often.
There is no symbol for non-electrolytes as they are not any single substance. Most non-electrolytes are compounds rather than elements and so have formulas, not symbols.
The atomic number is 8. It is a non-existent isotope of oxygen.
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non existent
I suppose they must be because they are both non-existent! I suppose they must be because they are both non-existent! I suppose they must be because they are both non-existent! I suppose they must be because they are both non-existent!
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Non-existent.
non-existent
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Non-existent.
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A non-existent Pokemon.
It is non-existent!