WiFi Advisor Channel Score exclamation symbol
Knowledge Base - FAQ
Why is there an exclamation mark (!) next to the Channel Score results in the Smart Channel Wizard?
An exclamation mark (!) next to the Channel Score means that there may be a better channel for the AP than the one it is currently configured for. Use the WiFi Advisor BSSID view, Channel View and Spectral tools to help determine which channel would be best and if a channel is advised.