Bluetooth
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Bluetooth is a short-range wireless technology standard that is used for exchanging data between fixed and mobile devices over short distances and building personal area networks (PANs). In the most widely used mode, transmission power is limited to 2.5 milliwatts, giving it a very short range of up to 10 metres (33 ft). It employs UHF radio waves in the ISM bands, from 2.402 GHz to 2.48 GHz. It is mainly used as an alternative to wired connections to exchange files between nearby portable devices and connect cell phones and music players with wireless headphones.
A Bluetooth earbud, an earphone and microphone that communicates with a cellphone using the Bluetooth protocol
Ericsson Bluetooth module PBA 313 01/2S R2A, manufactured in week 22 of 2001
A typical Bluetooth mobile phone headset from the early 2000's
A handheld, waterproof JBL Bluetooth speaker with a rechargeable battery, made in the late 2010s
Bind rune
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A bind rune or bindrune is a Migration Period Germanic ligature of two or more runes. They are extremely rare in Viking Age inscriptions, but are common in earlier (Proto-Norse) and later (medieval) inscriptions.
A boat whose mast is formed with the bind runes þ=r=u=t=a=ʀ= =þ=i=a=k=n, on the runestone Sö 158 at Ärsta, Södermanland, Sweden. The bind runes tell that the deceased was a strong thegn.
Cryptic runic inscription on a silver knife mount, with several bind runes
The "Derbyshire bone plate", showing the name Hadda with ligatured double ᛞ
A bind rune for the word runaʀ on the Sønder Kirkeby Runestone in Denmark