That symbol is MPG or Fuel Mileage - miles left in the tank.
Since the Icon is "on" is your Gas gauge on E?
Else the button on the end of the turn signal lever - you may have pressed it to move or bump the display to another mode it can show (Trip ODO - MPG - ODO (Real))
In this instance - that slash circle refers to Null or Empty - so the Fuel Pump and Empty - refers to Miles to Travel until Empty its calculated results are on the right side (7 or so miles/km) - so you know...