[Python] What's "ANSI_X3.4-1968" encoding?

See following output on my system:

$ python3 -c 'import sys; print(sys.stdout.encoding)'
ANSI_X3.4-1968

$ 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


Googled but found very little info about it. Even Python's The Python Library Reference (v3.5.2) does not mention it. Any international standard defines it?


(Copied the authoritative ref from the accepted answer's comment: Character Sets)

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