I3, I-3 or i3 may refer to:

Science and technology

  • Core i3, a microprocessor line from Intel
  • i3 (window manager), a tiling window manager
  • Triiodide (I<sub>3</sub><sup>−</sup>), an anion composed of 3 iodide atoms
  • Intermud-3, an InterMUD network method between MUDs
  • Axiom I3, a large cardinal axiom in rank-into-rank set theory

Transport

  • Interstate 3, a proposed Interstate Highway in the U.S. states of Georgia and Tennessee
  • BMW i3 (hatchback), an electric car by BMW
  • Inline-triple engine, an internal combustion engine with three cylinders in a straight line
  • LB&SCR I3 class, a British LB&SCR locomotive
  • Circuito Norte (I–3), a Cuban highway going along the northern coast of the island
  • Vía Blanca (I–3), motorway from Havana to Varadero
  • Autopista Sur (I–3), motorway in Varadero
  • Autopista Havana–Mariel (I–3), motorway from Havana to Mariel

Military

  • , a Type J1 submarine of the Imperial Japanese Navy
  • i3 fighter, a conceptual Japanese jet fighter proposed in 2010
  • Mikoyan-Gurevich I-3, a heavy interceptor prototype fighter of the 1950s
  • Polikarpov I-3, a 1928 Soviet biplane fighter

See also

  • 3I (disambiguation)