iBeacon (Apple)

iBeacon is a protocol standardized by Apple and introduced at the Apple Worldwide Developers Conference in 2013. – Wikipedia

iBeacon uses Bluetooth low energy proximity sensing to transmit a universally unique identifier picked up by a compatible app or operating system. The identifier can be used to determine the device’s physical location, track customers, or trigger a location-based action on the device such as a check-in on social media or a push notification.