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Bluetooth
Bluetooth is a wireless technology standard for exchanging data over short distances (using short-wavelength UHF radio waves in the ISM band from 2.4 to 2.485 GHz〔(【引用サイトリンク】title=Fast Facts )〕) from fixed and mobile devices, and building personal area networks (PANs). Invented by telecom vendor Ericsson in 1994,〔(【引用サイトリンク】publisher=hoovers.com )〕 it was originally conceived as a wireless alternative to RS-232 data cables. It can connect several devices, overcoming problems of synchronization.
Bluetooth is managed by the Bluetooth Special Interest Group (SIG), which has more than 25,000 member companies in the areas of telecommunication, computing, networking, and consumer electronics.〔Newton, Harold. (2007). ''Newton’s telecom dictionary.'' New York: Flatiron Publishing.〕 The IEEE standardized Bluetooth as IEEE 802.15.1, but no longer maintains the standard. The Bluetooth SIG oversees development of the specification, manages the qualification program, and protects the trademarks.〔(【引用サイトリンク】title=Bluetooth.org )〕 A manufacturer must make a device meet Bluetooth SIG standards to market it as a Bluetooth device.〔(【引用サイトリンク】title=Brand Enforcement Program )〕 A network of patents apply to the technology, which are licensed to individual qualifying devices.
==Name and logo==
The name "Bluetooth" is an Anglicised version of the Scandinavian ''Blåtand''/''Blåtann'' (Old Norse ''blátǫnn''), the epithet of the tenth-century king Harald Bluetooth who united dissonant Danish tribes into a single kingdom and, according to legend, introduced Christianity as well. The idea of this name was proposed in 1997 by Jim Kardach who developed a system that would allow mobile phones to communicate with computers. At the time of this proposal he was reading Frans G. Bengtsson's historical novel ''The Long Ships'' about Vikings and King Harald Bluetooth.〔Mark Forsyth. The etymologicon. // Icon Books Ltd. London N79DP, 2011. p. 139.〕 The implication is that Bluetooth does the same with communications protocols, uniting them into one universal standard.〔(【引用サイトリンク】title=About the Bluetooth SIG )〕
The Bluetooth logo is a bind rune merging the Younger Futhark runes 8px (Hagall) (ᚼ) and 8px (Bjarkan) (ᛒ), Harald's initials.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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