+E01 often denotes the first entry in a structured series or catalog. It serves as an initial identifier, marking the beginning of a [protocol](/wiki/protocol) or a specific [generation](/wiki/generation) of an item. Its simplicity implies a foundational start, preceding further iterations.
+## See also
+- [Identifier](/wiki/identifier)
+- [Series](/wiki/series)
+- [Index](/wiki/index)
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