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Octopus card

The Octopus card (Chinese: 八達通; Jyutping: baat3 daat6 tung1, Cantonese) is a reusable contactless stored value smart card for making electronic payments in online or offline systems in Hong Kong. Launched in September 1997 to collect fares for the territory's public transport system, it has grown into a widely used system for transport and other retail transactions in Hong Kong. It is al