1 in Roman numerals, how to write?

1 = I
0 = ? ... 2 = ?

In Roman numerals online converter

Latest conversions of numbers to Roman numerals

1 = I Oct 17 20:42 UTC (GMT)
175,012 = (C)(L)(X)(X)(V)XII Oct 17 20:42 UTC (GMT)
175,010 = (C)(L)(X)(X)(V)X Oct 17 20:42 UTC (GMT)
175,010 = (C)(L)(X)(X)(V)X Oct 17 20:42 UTC (GMT)
175,010 = (C)(L)(X)(X)(V)X Oct 17 20:42 UTC (GMT)
175,010 = (C)(L)(X)(X)(V)X Oct 17 20:42 UTC (GMT)
175,010 = (C)(L)(X)(X)(V)X Oct 17 20:42 UTC (GMT)
234,000 = (C)(C)(X)(X)(X)M(V) Oct 17 20:42 UTC (GMT)
175,010 = (C)(L)(X)(X)(V)X Oct 17 20:42 UTC (GMT)
175,008 = (C)(L)(X)(X)(V)VIII Oct 17 20:42 UTC (GMT)
175,008 = (C)(L)(X)(X)(V)VIII Oct 17 20:42 UTC (GMT)
175,008 = (C)(L)(X)(X)(V)VIII Oct 17 20:42 UTC (GMT)
98 = XCVIII Oct 17 20:42 UTC (GMT)
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Roman numerals reading rules, summary: