+**25b** often designates a specific [Variant](/wiki/Variant) or iteration within a larger [System](/wiki/System). This alphanumeric identifier typically implies a minor revision or an alternative branch from a primary "25" designation.
+## See also
+- [Designation](/wiki/Designation)
+- [Version Control](/wiki/Version_Control)
+- [Nomenclature](/wiki/Nomenclature)
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