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Like devices using 802.15 is called Bluetooth, 802.11 is WiFi, 802.16 is WiMAX... Wireless headsets, mouses, keyboards, and the like are just called "Wireless". But is there a name for the type of wireless besides 2.4 GHz wireless? Cause I think WiFi and bluetooth use the same frequency.

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It's defined in an IEEE standard as the "S band". 2.4GHz is actually just part of the wider S Band, which covers from 2GHz to 4GHz.

From Wikipedia:

Wireless network equipment compatible with IEEE 802.11b and 802.11g standards use the 2.4 GHz section of the S band. Digital cordless telephones operate in this band too.

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