Orbi, eero, Velop and Google Wifi are called mesh because you can install multiple access points that all communicate and can self-organize. There are three very important things that you need to remember about mesh,. First the Access Point can be Dual band (2 radio) or Tri-Band (3 radio), Second, a radio can be 4×4 or 2×2 (more rarely 3×3).

https://www.amazon.com/NETGEAR-Orbi-Whole-Home-System/dp/B07CQDHPFT