Answer
Awwaabeen is the six Rakaats of Salaat after the Maghrib Salaat. It is established from the Hadith.
Rasulullah [sallallallaahu Alayhi Wasallam] mentioned, ?Whoever performs 6 Rakaats after Maghrib Salaat will earn the reward of 12 years of Nafl Ibaadah.? (Tirmidhi)
and Allah Ta’ala Knows Best
Mufti Ebrahim Desai