What does the Fi in Wi-Fi mean?

Wi-Fi isn't short for anything

Source: http://www.webopedia.com/DidYouKnow/Computer_Science/wifi_explained.asp

It's simply a trademark. It does not stand for the commonly thought "Wireless Fidelity" (or your Fi guess, "Frequency Interface").

The term Wi-Fi, commercially used at least as early as August 1999, was coined by brand-consulting firm Interbrand Corporation. The Wi-Fi Alliance had hired Interbrand to determine a name that was "a little catchier than 'IEEE 802.11b Direct Sequence'". Phil Belanger, a founding member of the Wi-Fi Alliance who presided over the selection of the name "Wi-Fi", also stated that Interbrand invented Wi-Fi as a play on words with hi-fi, and also created the Wi-Fi logo.

The Wi-Fi Alliance used the "nonsense" advertising slogan "The Standard for Wireless Fidelity" for a short time after the brand name was invented, leading to the misconception that Wi-Fi was an abbreviation of "Wireless Fidelity".

Source: https://en.wikipedia.org/wiki/Wi-Fi

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