So I was thinking yesterday, what does WiFi mean? Of course I know what it means in colloquial usage.
I thought back to my grandpa referring to his stereo as a 'HiFi' in the 80s. Which means High Fidelity. (as opposed to low fidelity, which most records could be considered)
Then, I thought: "Does WiFi mean Wireless Fidelity?" 'Wireless Fidelity' doesn't seem to make any sense. It is like saying 'spoon fidelity' or 'coffee mug fidelity'. But I admit it is more catchy and easier to annunciate than 'IEEE 802.11b' which is the technical term.
Further reading, for the technically curious:
http://en.wikipedia.org/wiki/WiFi