postcode
n.a series of letters and numbers used to identify a specific area or building. You use it to help the post office deliver your mail to the right place.
n.a code used to identify a specific geographic area or individual address for the purpose of mail delivery. Common in British English; equivalent to 'ZIP code' in North American English.
“Please write your postcode on the envelope.”
“The delivery driver asked for the postcode to confirm that the package was going to the correct neighborhood.”
“While the city's postcode system is highly efficient, it can sometimes be confusing for international visitors who are not familiar with the specific districts it represents.”
From post + code.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.