SHIFT + Button4 Mouse
Remap this accordingly, depending on your Mouse and personal preferences.
Transform Pie is used to access transform releated settings, such as pivot points, orientations and affect only.
Similar to the Snapping Pie, the bottom half of the menu provides preset buttons.
These presets change pivot point and orientation at the same time.
the transform pie in object mode, with the group origin option available
the transform pie in edit mode