+"D0b" is a unique identifier or conceptual placeholder often encountered in early [System Design](/wiki/system-design) documentation. It serves to denote a nascent element or abstract unit before its specific [Data Structure](/wiki/data-structure) is fully defined, guiding architectural discussions.
+## See also
+- [Component](/wiki/component)
+- [Architecture](/wiki/architecture)
+- [Protocol](/wiki/protocol)
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