The Roman numeral in the parentheses is the valence or oxidation of the metal that it follows.
Transition elements have more than one oxidation number
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The Roman numerals CIC represent 199.
Roman numerals represent numbers, they do not represent words.
In today's notation of Roman numerals they represent 299 in Hindu-Arabic numerals
I is the number 1 in Roman numerals.
There is no T in Roman numerals