Codes used in several countries
ZZ on a licence plate
ZZ is an area code in 4 countries. The plate's style and country code tell them apart.
Germany
ZZ-AB 1234Code details →Burgenlandkreis (Saxony-Anhalt)
named after Zeitz
Greece
ZZ-1234Code details →Athens
Ireland
241-ZZ-12345Code details →AA Ireland, for the Revenue Commissioners
Norway
ZZ 12345Code details →Finnmark
named after Lakselv
Germany
Greece
Ireland
Norway