Weird characters appear when pressing command-A,C,V

Solution 1:

It looks like you have accidentally configured your control key to be your alt key. Case in point: when I press alt+a, I get å. alt+v returns √, and alt+c gives us ç. Go into your settings and check again. They are located in System Preferences -> Keyboard -> Modifier Keys. Note: alt is also option.

Edit: I cannot duplicate this phenomena (see comments on this answer), so I will guess that the non-Apple keyboard is messing up the process somehow.

Solution 2:

I've just run into that issue myself for my new Keychron K4 keyboard. It turned out that the switch was pointing to Windows mode, rather than OSx.