+**Beta** (Β, β) is the second letter of the [Greek alphabet](/wiki/Greek_alphabet). It frequently denotes a secondary or experimental phase, as seen in a [beta version](/wiki/Beta_version) of software under test before its final release. In finance, it quantifies a security's volatility relative to the broader market.
+## See also
+- [Alpha](/wiki/Alpha)
+- [Gamma](/wiki/Gamma)
+- [Software](/wiki/Software)
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