+**B1d** often denotes a distinct [Subtype](/wiki/Subtype) or specific variant within a larger [Classification](/wiki/Classification) system. It signifies a particular characteristic or identifier, helping to categorize specific entities for study or analysis.
+## See also
+- [Variant](/wiki/Variant)
+- [Identifier](/wiki/Identifier)
+- [Taxonomy](/wiki/Taxonomy)
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