Bluetooth Low Energy (BLE) is a low-power version of Bluetooth used for beacons and tags that report presence and approximate location, typically by measuring received signal strength rather than precise distance.
BLE shows up in forklift operations mostly for asset tracking, zone presence and low-cost location: beacons on carts, tags on pallets, or readers that note when a truck enters an area. Its strengths are long battery life and cheap hardware. Its weakness for collision warnings is that signal strength changes with bodies, loads and metal racking, so the estimated distance can swing even when nobody moves.
That difference matters when a buyer compares technologies. A warning system needs a distance figure it can trust at the moment a truck and a person converge, which is why many tag-based pedestrian warning systems use ultra-wideband ranging instead. BLE can still play a supporting role, for example to wake a tag or to carry configuration data. When a vendor says a system uses Bluetooth, ask whether it is used for ranging or only for communication, and test alert distances in your own aisles. The technology comparison sets out the trade-offs.