I is the ninth letter of the Latin alphabet.

I or i may also refer to:

Language

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Science, technology, and mathematics

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Biology

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Chemistry

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Computing

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  • i, a common generic index variable often used in program loops
  • <i>, an HTML element for marking italic type
  • .i, the common filename extension for a file that contains the output from a preprocessor
  • i-, a prefix for Apple products e.g. iMac, iPod, iPhone
  • i-, an Internet-related prefix used by Internet and electronic companies

Mathematics

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Physics and astronomy

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Telecommunication

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  • I band (NATO), the range of radio frequencies from 8 GHz to 10 GHz in the electromagnetic spectrum
  • I, the ITU prefix allocated to Italy in radio communication
  • I, in QAM modulation schemes, the in-phase communications channel

Other uses in technology

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  • i, a suffix unit for video resolution (vertical Interlaced lines), as in 480i or 1080i
  • I, in the YIQ colorspace commonly used with the NTSC television encoding scheme, the color-difference channel which is in-phase with the subcarrier

Arts and media

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Music

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Albums

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Songs

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Other media

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Mythology

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  • Goddess I, a Mayan deity
  • Hou-i, or I, a heroic archer and hunter in Chinese mythology

Vehicles and transportation

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Other uses

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See also

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