What is "ptichka"

Ptichka (, , Little Bird) is an informal nickname for the second space shuttle orbiter to be produced as part of the Soviet/Russian Buran program. It carried the GRAU index serial number 11F35 K2 and is - depending on the source - also known as "OK-1K2", "Orbiter K2", "OK 1.02" or "Shuttle 1.02". This Buran-class shuttle orbiter was never officially named. Ptichka was an informal nickname for all of the Buran-class orbiters.

OK-1K2 is distinguishable from the other Buran-class orbiters by a red framework attached to the top of its cargo bay doors.