Similar to 国別コードトップレベルドメイン

ISO 3166-1

List of FIFA country codes

List of IOC country codes

ISO 4217

List of telephone country codes

ITU prefix

.eg

.so

.tz

List of IATA-indexed railway stations

ISO 3166-3

List of ISO 639 language codes

List of ISO 639-2 codes

TCS

List of U.S. state and territory abbreviations

List of U.S. government and military acronyms