title: What's "ANSI_X3.4-1968" encoding?
body: <p>See following output on my system:</p>
  
  <pre class="lang-none prettyprint-override"><code>[STEP 101] # python3 -c 'import sys; print(sys.stdout.encoding)'
  ANSI_X3.4-1968
  [STEP 102] #
  [STEP 103] # locale
  LANG=C
  LANGUAGE=en_US:en
  LC_CTYPE="C"
  LC_NUMERIC="C"
  LC_TIME="C"
  LC_COLLATE="C"
  LC_MONETARY="C"
  LC_MESSAGES="C"
  LC_PAPER="C"
  LC_NAME="C"
  LC_ADDRESS="C"
  LC_TELEPHONE="C"
  LC_MEASUREMENT="C"
  LC_IDENTIFICATION="C"
  LC_ALL=C
  [STEP 104] #
  </code></pre>
  
  <p>Googled but found very little info about it. Even Python's <em>The Python Library Reference (v3.5.2)</em> does not mention it. Any international standard defines it?</p>
  
  <hr>
  
  <p>(Copied the authoritative ref from the accepted answer's comment: <a href="https://www.iana.org/assignments/character-sets/character-sets.xhtml" rel="noreferrer">Character Sets</a>)</p>