• all kinds of URLs and websites (YouTube, Facebook, Homepages)

• contact details (e.g QR code business cards or calling cards)

• dates and calendar entries (iCal)

• telephone numbers

• email messages

• Wi-Fi access credentials

• geo and navigation data

The term “QR code” is a registered trademark of Denso Wave Inc. across countries like Japan and the United States, as well as several European countries. When using the brand, appropriate notice is needed. however, if the QR code is only used as a pattern/picture/graphic/logo/icon (e.g. by including it on a website or when printed on a business card, brochure, leaflet, etc.) it is not necessary. Here’s some information you might like to take a look at: FAQ of QR code developer Denso Wave.