Postcodes in the United Kingdom
Postal codes used in the United Kingdom, British Overseas Territories and Crown dependencies are known as postcodes (originally, postal codes). They are alphanumeric (the UK is one of only 11 countries or territories to use alphanumeric codes out of the 160 postcode-using members of the ICU).
Source: Wikipedia — Postcodes in the United Kingdom (CC BY-SA 4.0)