REV indicator light (STI)
Subaru Impreza / Subaru Impreza Owners Manual / Instruments and controls / Warning and indicator lights / REV indicator light (STI)

This light illuminates when the engine speed reaches a level set by driver or when the tachometer needle enters the red zone.
See also:
Lubrication oil circulation in the refrigerant circuit
Operate the air conditioner compressor at a low engine speed (at idle or low driving speeds) a few minutes each month during the off-season to circulate its oil. ...
Passenger’s frontal airbag ON and OFF indicators
Refer to “Front passenger’s frontal airbag
ON and OFF indicators”. ...
Opening the trunk lid/unlocking rear gate
Opening the trunk lid/unlocking rear gate ...
