book of tickets; coupon tickets; discount ticket set
A set of multiple tickets sold together, often at a discount compared to buying single tickets. Common for trains, buses, and other services.
通勤に回数券を使っています。
I use a book of tickets for my commute.
バスの回数券を買うと少し安くなります。
Buying a bus coupon ticket book makes it a little cheaper.
I bought a book of train tickets at the station.
I used up all the tickets in my booklet, so I need to buy another one.
I still have three tickets left in my bus coupon booklet.
These coupon tickets can be used on any line.