Wi-Fi 4, 5, 6

Here come Wi-Fi 4, 5 and 6 in plan to simplify 802.11 networking names - CNET

• 802.11n = WiFi 4
• 802.11ac = WiFi 5
• 802.11ax = WiFi 6

"Even though there were older versions of the Wi-Fi specs -- 802.11a, 802.11b, 802.11g -- the Wi-Fi Alliance isn't going to try to reach back that far in time and attach any 1, 2 or 3 version numbers to them."