Î Ï Ï Ï Î 1\/2 ) . Based on these descriptions and the Byzantine sources , John Haldon and Maurice Byrne reconstructed the entire apparatus as consisting of three main components : a bronze pump ( the Ï Î Ï Ï Î 1\/2 , siphÅ n proper ) , which was used to pressurize the oil ; a brazier , used to heat the oil ( Ï Ï Ï Ï Ï