DAVID PARKER / SCIENCE PHOTO LIBRARY DAVID PARKER / SCIENCE PHOTO LIBRARY
Gamma is the third letter of the Greek alphabet. In the system of Greek numerals it has a value of 3. The lower-case letter is used widely as a symbol in nuclear physics, relativity theory, thermodynamics, neuroscience and astronomy. The Greek alphabet has an important role in the nomenclature of astronomical bodies and subatomic particles.
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