i3 https://tvdseo.com/nI3, I-3 or i3 may refer to:

== Science and technology ==
i3 (window manager), a tiling window manager
Triiodide (I3−), 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, 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

== Military ==
Japanese submarine I-3, 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 ==
Core i3, a microprocessor line from Intel
3i, a company headquartered in London, United Kingdom
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