411 REFERENCE · Wiktionary
Oyster card
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
Etymology
A marketing coinage; influences are said to include the security and value of the oyster's shell and pearl, the oyster beds of London's Thames estuary, and the popular idiom en the world is one's oyster.
Noun
Oyster card
A contactless smart card, introduced in 2003, used to pay for public transport in the Greater London area.