Greek letter crossword

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Across
  1. 2. The seventh letter, often used in engineering.
  2. 3. The second letter of the Greek alphabet.
  3. 5. A triangular Greek letter.
  4. 8. The third letter, often used in physics.
  5. 9. A very small amount, represented by this letter.
Down
  1. 1. The sixth letter, sounds like 'Z'.
  2. 4. The fifth letter of the Greek alphabet.
  3. 6. A Greek letter that looks like an 'A'.
  4. 7. A Greek letter that looks like a 'K'.
  5. 10. A Greek letter resembling a circle with a horizontal line.