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  1. Perpendicular Symbol (⊥)

  2. The "Up Tack (⊥)" Symbol in Mathematics

  3. Perpendicular - Wikipedia

  4. Perpendicular Lines – Definition, Symbol, Properties, Examples

  5. Perpendicular - Math.net

  6. Perpendicular Definition (Illustrated Mathematics Dictionary)

  7. Perpendicular Symbol (⊥): Unlock its Meaning, Uses & Example

  8. Perpendicular Lines – Definition, Symbol, Properties, Examples

  9. What are Perpendicular Lines? - DoodleLearning

  10. Perpendicular - math word definition - Math Open Reference