Stub

Stub is an attribute which specifies that if a symbol is ever used, Needs should automatically be called on the context of the symbol.

Symbols with the Stub attribute are created by DeclarePackage.

A symbol is considered "used" if its name appears explicitly, not in the form of a string.

Names["nameform"] and Attributes["nameform"] do not constitute "uses" of a symbol.

See The Mathematica Book: Section 2.5.3 and Section 2.6.11.