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IMFI is an acronym for "Initial, Medial, Final, Isolated", a writing system in which each character has four different potential shapes:

  • initial – used for the first character in a word
  • medial – used in the middle of a word
  • final – used for the last character in a word
  • isolated – used for single-letter words

The Arabic and Syriac script are examples of IMFI writing systems.