[Elecraft] + sign on K3 display ?

[Rick Hiller]

Hello, I am new to the K3 and Elecraft.  Bought a used one.  Liking it so
far.

On my K3 display, right hand lower corner there is a + sign displayed in CW
mode.  Why? 

I cannot find this in the manual.  On SSB OK -- ESSB, but this is OFF.

I'm sure that I have missed this setting in the manual, but where is it?
What does the + sign in CW mean?

What button did I push and shouldn't have.  ;-)

Thanks...73....Rick -- W5RH