Euro key

Euro key (German: Euroschlüssel) is a locking system which enables people with physical disabilities to access handicapped facilities free of charge. For example handicapped elevators and ramps, public toilets at motorways, train stations, in pedestrian zones, shopping centers, museums or public authorities etc. It has been introduced in 1986 by the CBF Darmstadt - Club Behinderter und Freunde in Darmstadt and environs.
Euro key is now widely used throughout European countries: Austria, Bulgaria, Czechia, Denmark, Finland, France, Germany, Ireland, Italy, Lichtenstein, Malta, Norway, Portugal, Romania, Slovakia, Spain, Sweden, Switzerland, UK. In Europe the total number of Euro key locks is over 100 000, in US it's about 350, in Turkey it's about 50.