limited express ticket; special express ticket
Abbreviation of 特別急行券. This ticket is usually required in addition to a basic fare ticket (乗車券) when riding a limited express train.
Please buy the limited express ticket together with the basic fare ticket.
この特急券で指定席に座れます。
With this limited express ticket, you can sit in a reserved seat.
乗車券 covers only the basic fare, while 特急券 is an extra ticket required on top of it to ride a limited express train.
Abbreviation of 特別急行券 (とくべつきゅうこうけん), literally 'special express ticket'.