Manipulator helpers are objects you can create to manipulate other objects. They let you add customized controls to your scene that provide visual feedback in viewports. To control other objects, manipulators use the Wire Parameters.
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Create panel > 
(Helpers) > Manipulators > Object Type rollout
Manipulators can be especially useful when you create a scene that will be used by more than one animator.
There are three kinds of manipulator helpers: Cone Angle, Plane Angle, and Slider.