2I
2I stands for:
- Polikarpov 2I-N1 , Soviet fighter prototype, see Polikarpov DI-1
- Kosmos-2I (GRAY index: 11K63), Soviet satellite launcher based on the R-12 (rocket)
- 2I / Borisov , an interstellar comet
2i stands for:
- Imaginary number + 2i
See also:
