Codes used in several countries
OE on a licence plate
OE is an area code in 4 countries. The plate's style and country code tell them apart.
Germany
OE-AB 1234Code details →Olpe (North Rhine-Westphalia)
Greece
OE-1234Code details →Athens
Ukraine
OE 1234 BCCode details →Chernivtsi Oblast
United Kingdom
OE51 ABCCode details →Oxford