+**151b** refers to a specific variant or instance within a larger [Classification](/wiki/Classification) framework. It carries unique attributes that distinguish its function and purpose from its counterparts, often serving as a key element in [System Architecture](/wiki/System_Architecture).
+## See also
+- [Variant](/wiki/Variant)
+- [Specification](/wiki/Specification)
+- [Taxonomy](/wiki/Taxonomy)
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