Ptichka (, "little bird"; GRAU index serial number 11F35 2K, Article 1.02 or OK-1.02) GRAU was a nickname for the second "Buran"-class orbiter, produced as part of the Soviet/Russian Buran programme. Although OK-1.02 was closest to being completed of any of the "Buran"-class orbiters (after the orbiter "Buran"), it was never finished. The program was officially cancelled in 1993, at which point the shuttle was 95-97% complete. The proposed official name for OK-1.02 was Burya (, "storm" or "tempest").