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'''Psi''' (Ѱ, ѱ) is a letter in the [[early Cyrillic alphabet]], derived from the [[Greek language|Greek]] letter of the same name. It was used in [[Russian language|Russian]] until 1708.
In [[mathematics]] (Ѱ, ѱ) is the angle between the [[tangent]] and the [[x-axis]] in the [[intrinsic coordinates]] system.
In [[Quntum physics]] (Ѱ, ѱ) can refer to the [[wave function]]
In [[Particle physics]] (Ѱ, ѱ) can refer to a particular [[meson]]
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