ISO Standards

1. Country code: https://en.wikipedia.org/wiki/ISO_3166-1

• ISO 3166-1 alpha-2 – two-letter country codes which are the most widely used of the three[citation needed], and used most prominently for the Internet's country code top-level domains （互联网顶级域名） (with a few exceptions).
• ISO 3166-1 alpha-3 – three-letter country codes which allow a better visual association between the codes and the country names than the alpha-2 codes.
• ISO 3166-1 numeric – three-digit country codes which are identical to those developed and maintained by the United Nations Statistics Division, with the advantage of script (writing system) independence, and hence useful for people or systems using non-Latin scripts.

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1. Currency code: https://en.wikipedia.org/wiki/ISO_4217
2. Can download Currency code from https://www.currency-iso.org/en/home/tables/table-a1.html

The first two letters of the code are the two letters of the ISO 3166-1 alpha-2 country codes (which are also used as the basis for national top-level domains on the Internet) and the third is usually the initial of the currency itself. So Japan's currency code is JPY—JP for Japan and Y for yen.

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1. Language code: https://www.loc.gov/standards/iso639-2/php/code_list.php?__cf_chl_jschl_tk__=630787a8ae75e80177f4a154480e7674a7b22d90-1592534841-0-ATjcSCaA9xJahqA4nuwu6YxkJD2qcXsA0v8VXkkRsOlzryZM6aXuAFupryVYfYdcn-MUo46bhG013eIXPVDKHZ60lGKCqbIgvbG5Vspng6psQxEEWumxFLspbY9A6p10An3vTByp9DaNj_0emWlARERi4vHW_gBvO_V9n9AgF-qslv7e3ejCnyYsqprimohn_zJQA7kzot8EXXpWXGUr2K6n8W-iZSFbQLaC7N8QNh2KN5fkeclyXblq0kuvW3tcbXPZ8i616IAM02irB9ScrLY3yjFYB_9ptYtUOSxtLEAqlk2e68-GQo9XGK6tJPyXZw

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1. Timezone code:

 

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1. https://www.cia.gov/library/publications/the-world-factbook/