[7, 8, 9] in iex returns '\a\b\t' Why?

Questions / Help
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As other said, in addition You can use i/1 helper function in IEx session to get more informations about given type:

iex(1)> i [7,8,9]
Term
  '\a\b\t'
Data type
  List
Description
  This is a list of integers that is printed as a sequence of characters
  delimited by single quotes because all the integers in it represent printable
  ASCII characters. Conventionally, a list of Unicode code points is known as a
  charlist and a list of ASCII characters is a subset of it.
Raw representation
  [7, 8, 9]
Reference modules
  List
Implemented protocols
  Collectable, Enumerable, IEx.Info, Inspect, List.Chars, String.Chars
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