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Iblis: The primary devil in the Koran.

I Ching: Pronounced ee-ching, translates literally as "The Book of Changes". It is a text used to provide guidance in life. The user puts a question to the I Ching and looks for answers relevant to their situation.

Illuminism: The process of attaining spiritual enlightenment.

incubus: In occultism, a demon or goblin which appears as a male mortal seeking to seduce women, usually while they sleep. The female version is a succubus.

Ishtar: The Babylonian goddess of love and fertility, equivalent of Venus or Isis.