2.01 (Buran-class spacecraft)
2.01 (GRAU index serial number 11F35 3K) is the designation of the third Buran-class orbiter to be produced as part of the Soviet/Russian Buran programme. Its construction was not complete when the Buran programme was cancelled (30–50 percent done), so it remains unfinished.
Source: Wikipedia — 2.01 (Buran-class spacecraft) (CC BY-SA 4.0)