Rahau or Rahao are words that refer to the Gurmukhi word ਰਹਾਉ that appears frequently almost in every Shabad in the Sri Guru Granth Sahib. The word always appears at the end of a Tuk of line of Gurbani. Except for Raag Tukhari, we find the mention of Rahau in nearly all the other Bani. Depending on the type of Shabad (Chaupada - 4 liner, Ashtpadi - 8 liner, etc.) somewhere within the Shabad the word Rahau will be mentioned, It sometimes appears with the numeral 1. * based on article by Angad Singh