The Hyper Accelerated Dragon is a very early ...g6 from Black. The Dragon Variation (1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6) was always one of the classic Sicilian options giving that instantly recognizable pawn structure. It was a favorite of many players.
The problem was White developed very annoying openings like the Yugoslav Attack, Sozin Attack, Richter Rauzer Attack and others that interfered with the Dragon so Black had to modify his move order to get his pet line in.
He came up with the Accelerated Dragon (1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6) getting ...g6 in one move earlier and solving the problem.
Black even cut it down still further with the Hyper Accelerated Dragon (1.e4 c5 2.Nf3 g6) yes ...g6 on the second move! Dragon fans can play their openings with a safe King and no harassment from White's attack lines mentioned above.