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The $23$rd letter of the Greek alphabet.

Minuscule: $\psi$
Majuscule: $\Psi$

The $\LaTeX$ code for \(\psi\) is \psi .

The $\LaTeX$ code for \(\Psi\) is \Psi .


$\map \psi x$

The Greek letter $\psi$, along with $\phi$ and $\chi$ and others, is often used to denote a general mapping.

In the context of abstract algebra, it often denotes a homomorphism.

The $\LaTeX$ code for \(\map \psi x\) is \map \psi x .

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