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I9, i9 or I-9 may refer to:

Science and technology[edit]

  • Intel Core i9, a line of high performance processors of the Skylake-X and Kaby Lake-X range
    • Gulftown, microprocessors originally rumored to be called the Intel Core i9
  • Straight-nine engine, a straight engine with nine cylinders, usually diesel engines used for ship propulsion
  • ICD-9, a coding system for medical diagnoses and procedures

Other uses[edit]

See also[edit]