What do the letters 'QR' in QR code stand for?
AnswerQuick Response
QR stands for Quick Response, because the codes can be read quickly by a scanner or phone camera.
Challenge · Facts & stats
Ticket facts & stats
7 fact-checked facts about tickets, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
In British English, a 'return' ticket is what Americans usually call what?
AnswerA round-trip ticket
A return ticket covers travel to a destination and back again, known in the US as a round trip.
Going deeper
Who invented the pre-printed, numbered cardboard railway ticket in England in the 1830s?
AnswerThomas Edmondson
Station master Thomas Edmondson created numbered card tickets and a dating press, used on railways for over a century.
What does RFID, used in many contactless tickets and passes, stand for?
AnswerRadio-Frequency Identification
RFID uses radio waves to read data stored on a small chip, with no need for direct contact.
The QR code was invented in 1994 in which country?
AnswerJapan
The QR code was developed in Japan in 1994, first to track car parts during manufacturing.
Expert level
How many size 'versions' does the QR code standard define?
Answer40
QR codes come in versions 1 to 40, from 21×21 modules up to 177×177 modules.
Which error correction method lets a partly damaged QR code still scan correctly?
AnswerReed–Solomon error correction
QR codes use Reed–Solomon error correction, which can recover data even when part of the code is damaged.
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