+De1 commonly denotes a primary [Data Element](/wiki/Data_Element) or an initial design component within a structured system. It represents a foundational instance in a defined sequence, often crucial for [System Architecture](/wiki/System_Architecture) or conceptual modeling.
+## See also
+- [Data Model](/wiki/Data_Model)
+- [Entity Relationship](/wiki/Entity_Relationship)
+- [System Component](/wiki/System_Component)