CgGuU‖

FiNB9‖Flip Vertically

fy9eJ‖Flips the selected object(s) vertically from top to bottom.

To access this command...

ebLJB‖From the menu bar:

t8dFS‖From the context menu:

DvsqQ‖Choose Rotate or Flip - Vertically

sXy2C‖From toolbars:

8pgx8‖ Icon Flip Vertically

WXUR7‖Flip Vertically