SAS airbag commonly refers to Supplemental Airbag System airbag
While the reference material mentions "Supplemental Restraint System Airbags," SAS can also stand for Supplemental Airbag System, implying the same protective function. Both terms describe airbags that supplement the protection offered by seatbelts. The critical point is that the airbag is an addition to the primary restraint system (seatbelt), hence the term "supplemental."