Readers of a certain age probably know the full words to the acronyms in this blog edition.  Hi-Fi refers to high fidelity and the stereo receivers and amplifiers of the 1960s that reproduced music with greater frequency range.  Wi-Fi refers to wireless fidelity, possibly a stretched play on words using the Hi-Fi concept to cover wireless broadband access.  The mostly male, engineers that served on various 802.11 Institute of Electrical and Electronics Engineers standards groups must have had a chuckle.