2I or 2-I may refer to:

• Kosmos-2I Soviet rocket
• AceKard 2i, one of the Nintendo DS storage devices
• Base 2i, or Quater-imaginary base
• The binary icosahedral group 2I
• SSH 2I (WA), now U.S. Route 97 in Washington
• The 2i's Coffee Bar in London
• Polikarpov 2I-N1, alternate name for the Polikarpov DI-1 fighter
• Kosmos-2I 63S; see List of Kosmos satellites (1–250)
• 2I/Borisov, the first known interstellar comet

• I2 (disambiguation)

Topics referred to by the same term

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