+A00 marks a primary designation, often the very first entry in a structured sequence. It serves as a foundational identifier, establishing the [base](/wiki/base) from which a [system](/wiki/system) begins. This initial label provides a starting point for further categorization and development.
+## See also
+- [Classification](/wiki/classification)
+- [Index](/wiki/index)
+- [Origin](/wiki/origin)
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