If you mean the Dewey Decimal Classification, a system of organizing library books by subject: that was invented by Melvil Dewey in 1876.
If instead you mean the decimal-based metric system: the impetus for the invention came from King Louis XVI of France in the 1790s, but the idea itself is at least a century older than that.
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Decimal.
The decimal system.
030 is 30, which is a number in the decimal system.
The decimal system is the same anywhere. Dec means 10 so the decimal system is a system used on the base 10 system.
decimal system.