- ISO 3166-1 alpha-2 provides two-letter codes for countries (e.g., ME for Montenegro) and non-country entities (e.g., EU for European Union).
- These codes appear in top-level domains and emoji flags (e.g., :flag_fm: for Micronesia).
- Many programming languages share their file extensions with country codes (e.g., .rs for Rust and Serbia).
- The article lists examples like AM (Armenia/Automake), ES (Spain/ECMAScript), PY (Paraguay/Python), and RS (Serbia/Rust).
- The author invites readers to suggest additional matches not included in the list.