Two switch with three black wires
Its just two separate switches in a single yoke.  

Also, the supply wire is common to both switches, because the switch is configured that way.  The black screw is the common. 

Note that there is another black screw on the other side of the switch... If for some reason you needed each switch to have a separate/different supply, the other black screw would come into play.  Right now both black screws are internally jumpered to each other, but that jumper could be removed if you needed each switch to have a separate supply.  So if you see anything weird on that switch that looks removable, don't remove it.   That's the jumper.