Codes used in several countries
SLU on a licence plate
SLU is an area code in 2 countries. The plate's style and country code tell them apart.
Germany
SLÜ-AB 1234Code details →Main-Kinzig-Kreis (Hesse)
named after Schlüchtern
Poland
SLU 12345Code details →powiat lubliniecki (Silesian)
Germany
Poland