Wave function

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A topic known well beyond its field, found in many languages.

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What Wikipedia says

In quantum mechanics, a wave function (or wavefunction) is a mathematical description of the quantum state of an isolated quantum system. The most common symbols for a wave function are the Greek letters ψ and Ψ (lower-case and capital psi, respectively).

Excerpt from the Wikipedia article “Wave function”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Maschen, CC0, via Wikimedia Commons.