New
#1
Looks like you have updated to 2004. New for 2004 is that the WiFi icon indicates a secure connection with a 'padlock' overlaid on the WiFi icon.
This padlock symbol is actually a character from a font, and if there is a problem with that font it will appear as an 'unknown character' block.
See this thread for more on that: Square icon overlay on wifi icon (After upgrading to Windows 10 2004)