what is a side sensor? on 2004 Nissan Sentra

I am trying to order a dash cover for my 2004 nissan sentra and they ask if i have a side sensor cut out on the dash, what is a side sensor?

Asked by for the 2004 Nissan Sentra
They may be referring to a climate control sensor that monitors cabin temperature?
or the sensor that is right beside the heads which sends energy to the motor