Axis Alignment

Mirror Normals:

Mirrors the selected normals on the X, Y, or Z axis.

This is not a live mirror like the Tool Settings option. This will mirror the selected normals just once.

Flatten Normals on Axis:

Flatten the selected normals on the object's local X, Y, or Z axis.

Align to Axis:

Points the selected normals along the positive or negative local X, Y, or Z axis.