回数券

1. Origins, structure, and basic meaning

• Structure: 回数券 (かいすうけん) is a multi-ride ticket or a book of tickets for repeated use.
• Basic usage: バスの回数券を購入する buys the ticket booklet, while 残った回数券を財布に入れる refers to the unused tickets left from it.

2. Common pitfalls and similar expressions

• Ticket book and remaining tickets
  • The purchase context can denote the bundle as one product; after use, the same form can denote the individual tickets that remain.