The option WorkingForm
The WorkingForm option and some of its possible values.
The option WorkingForm specifies the form or environment the Notation, Symbolize or InfixNotation statement is generated in. The typical values of WorkingForm are StandardForm or TraditionalForm; any notations created would only apply in StandardForm or TraditionalForm (respectively). However, WorkingForm can be set to any form you define, for instance LogicForm, PhysicsForm etc.
When the option WorkingForm is set to Automatic the Notation, Symbolize or InfixNotation statement will be created in the DefaultOutputFormatType. This form is show in the menu item Default Output Format Type under the menu Cell.
This creates TraditionalForm notations for the vector calculus functions Div, Curl and the wrapper Vector.
These notations behave as expected.