WiFi 6E means WiFi 6 extended to the 6 GHz band, a newly-opened frequncy bringing more bandwidth, faster speeds, and lower latency.
What's WiFi 6 & WiFi 6E
Linksys The Future of WiFi: WiFi 6E
What Is WiFi 6E? What Is the Difference Between WiFi 6E and WiFi 6? - Huawei
What is WiFi 6E? WiFi 6E Mesh and Routers - NETGEAR
What Is Wi-Fi 6E? – Intel
WiFi 5 vs WiFi 6 vs WiFi 6E: Comparing Speed, Performance, Compatibility
Wi-Fi 6E Standards & Channels- LitePoint
WiFi 6E Zyxel Networks
WiFi 6 (802.11 ax)- Benefits of the WiFi ax standard
Solutions - Wi-Fi 6E: The Next Great Chapter in Wi-Fi White Paper - Cisco