Bluetooth Low Energy
The latest iteration of Bluetooth, also called Bluetooth 4.0. It offers lower power use for portable devices and new profiles including Bluetooth Mesh, a Bluetooth topology that allows devices to be connected together, sending/repeating commands from the hub to any connected device. Apple’s iBeacon is an example of a BLE application, and BLE as many potential uses for IoT devices.
Source:
http://www.aeris.com/iot-dictionary/
References:
https://en.wikipedia.org/wiki/Bluetooth_low_energy
https://uk.wikipedia.org/wiki/Bluetooth_з_низьким_енергоспоживанням