回数券 (kaisuuken) Japanese meaning: book of tickets | KotomoraI use a book of tickets for my commute.
Buying a bus coupon ticket book makes it a little cheaper.
Usage patterns
〈物〉を買うto buy a book of tickets
I bought a book of train tickets at the station.
回数券を使い切るto use up all the tickets in a coupon booklet
I used up all the tickets in my booklet, so I need to buy another one.
回数券が残っているto have tickets left in the booklet
I still have three tickets left in my bus coupon booklet.
回数券は〈場所〉で使えるthe coupon tickets can be used at (a certain place/line)
These coupon tickets can be used on any line.