Greek letters

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Across
  1. 3. – The sixteenth letter; represents the math constant 3.14159
  2. 5. – The last letter of the Greek alphabet
  3. 7. – The twentieth letter of the Greek alphabet
  4. 9. – The ninth letter; often means something very small
  5. 11. – The first letter of the Greek alphabet
  6. 13. – The second letter; used in software testing phases
  7. 15. – The eighteenth letter; symbol for summation
Down
  1. 1. – The fifteenth letter; used in naming virus variants
  2. 2. – The eleventh letter; used in physics and computer science
  3. 4. – The fourth letter; symbol for change
  4. 6. – The third letter; used in physics for rays
  5. 8. – The twenty-first letter; linked with the golden ratio
  6. 10. – The eighth letter; used in trigonometry for angles
  7. 12. – The sixth letter of the Greek alphabet
  8. 14. – The fourteenth letter of the Greek alphabet