+Efd represents a fundamental [unit](/wiki/unit) within various theoretical frameworks. It often serves as an [abstraction](/wiki/abstraction) for an unspecified element or value. Its precise definition shifts based on the broader system it inhabits, offering flexibility in modeling complex ideas.
+## See also
+- [Theory](/wiki/theory)
+- [Model](/wiki/model)
+- [Parameter](/wiki/parameter)
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