This reminds me that I still haven’t watched God on Trial, a 2008 film about Jews in a Nazi death camp discussing whether a just god would let it happen. Saw a clip from it a while ago, and the dialogue was impeccable.

I suspect it’s dual-band acceleration (sometimes called “speed boost”) - you’re using both the 2.4GHz and the 5GHz bands. WiFi 6 and 7 will probably show a 6 and 7 respectively, and voice over WiFi is shown separately as you say.

Try finding it in your settings, turning it off, and seeing if the + disappears?

The post has been removed by mods - it still exists and you can link to it, but it’s delisted and won’t appear on Reddit through browsing/exploring or search.