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NumericFunction
NumericFunction is an attribute that can be assigned to a symbol f to indicate that f[
,
, ... ] should be considered a numeric quantity whenever all the  are numeric quantities.
Most standard built-in mathematical functions have the attribute NumericFunction.
NumericQ checks the NumericFunction attribute of every function it encounters.
If you assign the attribute NumericFunction to a function that does not yield numerical values, then NumericQ will give misleading results.
See the Mathematica book: Section 2.5.3, Section 3.1.2.
See also: NumericQ, NHoldAll.
Further Examples
E is a numeric quantity and NumericFunction is an attribute of Sin.
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