You use it on every single element
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antony
When naming compounds. For example, Iron (VI) Carbonate.
I'm not sure if it has a name, but most call it 'naming ionic compounds with multiple ion charges'. I think that what you're looking for is the "Stock System."
No, Roman numerals are not used in covalent compounds. Roman numerals are used in the naming of ionic compounds to indicate the charge of a transition metal ion. In covalent compounds, the elements are combined through sharing of electrons and do not involve ions with specific charges.
Chemical compounds are not named in Roman numerals!