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Not to be confused with ln (with first letter "L"), the notation of the natural logarithm.

IN, In or in may refer to:


Businesses and organizations[edit]

In science and technology[edit]

  • .in, the internet top-level domain of India
  • Inch (in.), a unit of length
  • Indium (symbol In), a chemical element with atomic number 49
  • Intelligent Network, a telecommunication network standard
  • Intra-nasal (insufflation), a method of administrating some medications and vaccines

Other uses[edit]

  • Imperishable Night, the eighth official game in the Japanese Touhou series
  • Indonesian language (former ISO 639-1 language code; "id" used since November 3, 1989)
  • In Nomine, a title given to any of numerous short pieces of English polyphonic instrumental or vocal music during the 16th and 17th centuries

See also[edit]