The IEEE is the Institute of Electrical and Electronics Engineers.
They release various technical standards, including the IEEE 802.x network protocol standards for LANs and MANs e.g. Ethernet, TokenRing, WLAN, ...
The IEEE has formally defined many of the protocols one is likely to see on networks today. Wireshark has dissectors for many of these protocols including:
IEEE 802.3 - Ethernet
IEEE 802.5 - TokenRing
IEEE 802.11 - Wi-Fi
IEEE 802.1Q - VLAN
IEEE 802.2 - LLC
IEEE 802.3ad-2000 - LinkAggregationControlProtocol (lacp)
IEEE 802.1AB - LinkLayerDiscoveryProtocol (lldp)
XXX - Need to update this list to include references to all IEEE based protcols supported by Wireshark.
XXX - Should the list be sorted alphabetically by IEEE spec number?