What is the number displayed left bottom of WiFi icon?

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The number displayed to the left of the Wi-Fi icon refers to the Wi-Fi standard of the current connection:

• WiFi 4 - 802.11n (operates in the 2.4/5 GHz frequency range only and supports speeds up to 600 MB/s)
• WiFi 5 - 802.11ac (operates in the 5 GHz frequency range only and supports speeds up to 3466.8 MB/s)
• WiFi 6 - 802.11ax. (operates in both the 2.4/5 GHz frequency ranges and supports speeds up to 9608 MB/s)

MB/s stands for megabytes per second. MB is used in reference to file size, or the amount of data transferred.