Octopus card facts for kids

Octopus reader at an MTR ticket gate
The Octopus card is a reusable contactless stored value smart card for making electronic payments in Hong Kong. Started in September 1997 to collect fares for the MTR, the Octopus card system is the second contactless smart card system in the world, after the Korean Upass, and has been widely used for all public transport in Hong Kong, It leads to the development of Oyster Card in London.
Term
Baat Daaht Tùng (Cantonese Pronounciation) translates as "eight-arrived pass" (in Chinese it was accepted as "go-everywhere pass"), where Baat Daaht may translate as "reaching everywhere". It was selected by the head of the MTR, the parent company of Octopus Cards Limited, in a naming competition held in 1996.
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Octopus card Facts for Kids. Kiddle Encyclopedia.