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networking Either of two different incompatible radio-based
LAN protocols, namely 802.11b (which speaks DSSS at
2.4GHz) and 802.11a (which speaks OFDM at 5GHz).
The term was invented by the marketing departments of wi-fi
equipment manufacturers. It is, notionally, short for
"wireless fidelity", on the analogy of hi-fi for "high
fidelity" audio.