Analysis of information sources in references of the Wikipedia article "X" in English language version.
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roman numerals.
In the course of time, I, V and X became identical with three letters of the alphabet; originally, however, they bore no relation to these letters.
{{cite book}}: ISBN / Date incompatibility (help) See History of algebra.{{cite web}}: CS1 maint: periodical has ISBN (link){{cite web}}: CS1 maint: periodical has ISBN (link)In the course of time, I, V and X became identical with three letters of the alphabet; originally, however, they bore no relation to these letters.
{{cite book}}: ISBN / Date incompatibility (help) See History of algebra.