+**A02** is a common designator for a second-tier element within various classification systems. It often signifies a specific subset or component, following a primary "A01" category. This brief identifier helps in organizing and referencing complex information within structured [Data Systems](/wiki/Data_Systems) or [Taxonomy](/wiki/Taxonomy) schemes.
+## See also
+- [Classification](/wiki/Classification)
+- [Identifier](/wiki/Identifier)
+- [Categorization](/wiki/Categorization)
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