Wikipedia
Pasmo
is a rechargeable contactless smart card ticketing system for public transport introduced in Tokyo, Japan, on March 18, 2007.
Pasmo is a development of the Passnet system used by many non JR railway lines in the Tokyo region. The system offers interoperability with the JR East Suica system, as well as integrating private bus companies into the former Passnet network.
The technology is based on RFID technology developed by Sony corporation known as FeliCa. Pasmo is available as a credit-card-sized card.
As of April 2009, over 11 million cards are in circulation.