DAVID PARKER / SCIENCE PHOTO LIBRARY DAVID PARKER / SCIENCE PHOTO LIBRARY
Psi is the 23rd letter of the Greek alphabet and has a numeric value of 700. The letter psi is commonly used in physics for representing a wavefunction in quantum mechanics. It is also used in biochemistry, pharmacology and computational theory. The Greek alphabet has an important role in the nomenclature of astronomical bodies and subatomic particles.
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