"Bluetooth"
From Bradley Mitchell,
Your Guide to Wireless / Networking.
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Definition: BlueTooth is a specification for the use of low-power radio communications to wirelessly link phones, computers and other network devices over short distances. The name "Bluetooth" is borrowed from Harald Bluetooth, a king in Denmark more than 1,000 years ago.
Bluetooth technology was designed primarily to support simple wireless networking of personal consumer devices and peripherals, including cell phones, PDAs, and wireless headsets. Wireless signals transmitted with Bluetooth cover short distances, typically up to 30 feet (10 meters). Bluetooth devices generally communicate at less than 1 Mbps.
Why did they use the name of the Danish King? ???
Never mind GGNK. They named the technology bluetooth long before the Danish decided to be abusive to Islam.