Eryk Sun added the comment:
Character names are in field 1 of UnicodeData.txt [1][2]. For controls the name
is just "<control>". In Tools/unicode/makunicodedata.py, the makeunicodename
function skips names that start with "<". Instead of skipping the character, it
could fall back on the Unicode 1.0 name (field 10), if it's defined. For
controls, this is the ISO 6429 name:
(10) Old name as published in Unicode 1.0 or ISO 6429 names
for control functions. This field is empty unless it is
significantly different from the current name for the
character. No longer used in code chart production. See
Name_Alias.
The names of control characters are also in NameAliases.txt, which gets
processed as the unicode.aliases list of (name, char) tuples.
[1]: http://www.unicode.org/reports/tr44/#UnicodeData.txt
[2]: http://www.unicode.org/Public/8.0.0/ucd
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nosy: +eryksun
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