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The 'Symmetrize UVs' command mirrors UVs of polygons from one side to another in UV space. Pairs of polygons to mirror must be symmetrical in 3D space. The command is found in the 'UVedit' layout of the interface. LMB+click the button to open the following dialog, select the appropriate options and press OK to apply.
Symmetry Axis: Symmetry axis on 3D space. 3D mesh must be symmetric on this axis.
Direction: Mirror direction on UV space. "Positive to Negative" copy UVs from right side to left side.
Mirror Axis: Mirror axis component on UV space. The specific component of UV value is mirrored.
Align to Symmetry Axis: Rotate UV islands to align symmetry axis.
