i2, I-2, I 2 or I2 may refer to: I2, a statistical measure of study heterogeneity used in meta-analysis I2, a military acronym for an image intensifier I2, the chemical formula for molecular iodine I2 engine, a designation for a straight-twin engine i2 Limited, a visual investigative analysis software company (now part of IBM) i2 Technologies, an international supply chain management firm Haplogroup I2 (Y-DNA), the human Y-chromosomal haplogroup LB&SCR I2 class, a 1907 British class of 4-4-2 steam tank locomotive Grigorovich I-2, a biplane fighter aircraft of the Soviet Union Internet2, a not-for-profit US computer networking consortium Interstate 2, a highway in the US state of Texas Göta Life Guards (infantry) (1816–1939), a Swedish Army infantry regiment Värmland Regiment (1939–1973), a Swedish Army infantry regiment I2, a rank-into-rank axiom in mathematical set theory Incredibles 2, a 2018 American computer-animated superhero film by Pixar Iberia Express, a Spanish low-cost airline (IATA code: I2) , a Type J1 submarine of the Imperial Japanese Navy See also I 2 (EYE), a 1988 album by Michael W. Smith i2 Aquarii, a star Interstate 2 (disambiguation)