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Coined in analogy to Hi-Fi as a trade name developed for the Wireless Ethernet Compatibility Alliance (later Wi-Fi Alliance).
Often analyzed as a shortened form of wireless fidelity (similar to how hi-fi is short for high fidelity); this is possibly due to the former slogan of the aforementioned Wi-Fi Alliance, The Standard for Wireless Fidelity.
^ Janice Reynolds (2003) Going Wi-Fi: Networks Untethered with 802.11 Wireless Technology, CRC Press, →ISBN, page 3: ““Wi-Fi” is a play on the old audio term “Hi-Fi” (high fidelity). The term also has been trademarked by the Wi-Fi Alliance (formerly the Wireless Ethernet Compatibility Alliance).”
^ Barrie Sosinsky (2009) Networking Bible, John Wiley & Sons, →ISBN, page 356: “Wi-Fi was created by the Interbrand Corporation in 1999 to replace the name IEEE 802.11b Direct Sequence, and it remains a brand name with no real relationship to the technology it describes.”