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 for standard I/O
From The Free On-line Dictionary of Computing (30 December 2018) :

  standard input/output
  standard I/O
      The predefined input/output
     channels which every Unix process is initialised with.
     Standard input is by default from the terminal, and standard
     output and standard error are to the terminal.  Each of these
     channels (controlled via a file descriptor 0, 1, or 2 -
     stdin, stdout, stderr) can be redirected to a file, another
     device or a pipe connecting its process to another process.
     The process is normally unaware of such I/O redirection,
     thus simplifying prototyping of combinations of commands.
     The C programming language library includes routines to
     perform basic operations on standard I/O.  Examples are
     "printf", allowing text to be sent to standard output, and
     "scanf", allowing the program to read from standard input.

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