Where does “ローマ数字” come from?

ローマ数字 (Japanese) comes from Japanese ローマ, from Italian Roma, from Latin Rōma — Rome and/or Constantinople (the latter as "Nova Roma").

ローマ数字 (Japanese): a Roman numeral

Definitions

  1. a Roman numeral

Ancestry of “ローマ数字”, step by step

ローマ数字 traces back through two separate lines of ancestry.

via Japanese ローマ

StepLanguageWordMeaning
1JapaneseローマRome, Roman
2ItalianRomaRome
3LatinRōmaRome and/or Constantinople (the latter as "Nova Roma")

via Japanese 数字

StepLanguageWordMeaning
1Japanese数字a digit; a numeral; a figure, a thing expressed...
Every word from Latin Rōma →Every word from Italian Roma →Every word from Japanese ローマ →