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  1. What is the 'X' Symbol? 6 Powerful Meanings

  2. The Letter 'X' Stands for the Unknown, the Mysterious, and the ...

  3. Special Symbols - The Physics Hypertextbook

  4. Science Symbols | Definition, Uses & Examples | Study.com

  5. Science Symbols and Meanings - EdrawMax Online

  6. The Mysterious Origins of 'X' in Algebra - Scientific American

  7. Exhaustive List of Mathematical Symbols and Their Meaning

  8. List of common physics notations - Wikipedia

  9. Greek letters used in mathematics, science, and engineering

  10. Type mathematical symbols - online keyboard

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