Hard to say for sure without seeing the other stat abbreviations.
90% sure that it means Fumbles Lost.
FL usually refers to the flanker, which is a wide receiver who lines up behind the line of scrimmage.
On an ultrasound, FL means femoral length.
Florida
180 miles taking I-95 NORTH.
234 miles taking I-95 SOUTH.
356 miles taking I-10 EAST.
210 miles taking I-75 NORTH.
'fl' stands for fluid and 'oz' stands for ounces.
130 miles taking I-4 WEST.
75 miles taking I-4.
24 miles taking SR-44.
132 miles taking I-4.