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Greek/Hebrew/Latin-based Symbols in Mathematics - Math Vault
Mathematical Alphanumeric Symbols - Wikipedia
Glossary of mathematical symbols - Wikipedia
Algebra symbols list - RapidTables.com
Latin letters used in mathematics, science, and engineering
Math Symbols
Latin Small Letter X - Wumbo
Compendium of Mathematical Symbols - Math Vault
X marks the unknown in algebra – but X’s origins are a math …
The Letter 'X' Stands for the Unknown, the Mysterious, and the ...