DAVID PARKER / SCIENCE PHOTO LIBRARY DAVID PARKER / SCIENCE PHOTO LIBRARY
Mu is the 12th letter of the Greek alphabet. In the system of Greek numerals it has a value of 40. The lower-case letter mu is used as a special symbol in many scientific and academic fields including: Mathematics, chemistry, pharmacology, orbital mechanics, physics and engineering. The Greek alphabet has an important role in the nomenclature of astronomical bodies and subatomic particles.
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