Codes used in several countries
ZK on a licence plate
ZK is an area code in 3 countries. The plate's style and country code tell them apart.
Greece
ZK-1234Code details →Athens
Norway
ZK 12345Code details →Troms
named after Tromsø
Poland
ZK 12345Code details →Koszalin (West Pomeranian)
Greece
Norway
Poland