icu4c/source/data/zone/zh_TW.txt

// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
// Generated using tools/cldr/cldr-to-icu/build-icu-data.xml
zh_TW{
    "%%ALIAS"{"zh_Hant_TW"}
}