suica
Super Urban Intelligent Card, a type of smartcard used by East Japan Railway for fares in Kantou region. The name is a play on the word "suika", ie. watermelon, and also the combination of the ideophone "sui sui", ie. "moving smoothly", and "card". Thanks to the good recognisability of the name, it's well suited for puns.
See also
- Wikipedia page: http://en.wikipedia.org/wiki/Suica
- pasmo