While all 802.11a/b/g products are called Wi-Fi, only products that have passed the Wi-Fi Alliance testing are allowed to refer to their products as “Wi-Fi Certified” (a registered trademark). Products that pass are required to carry an identifying seal on their packaging that states “Wi-Fi Certified” and indicates the radio frequency band used (2.5GHz for 802.11b or 11g, 5GHz for 802.11a)
This group was formerly known as the Wireless Ethernet Compatibility Alliance (WECA) but changed its name in October 2002 to better reflect the Wi-Fi brand it wants to build.