That indicates which VFO the keypad band selection controls.  Press and 
hold the A/B button to switch the highlight between A & B.
73,
Alan  N5NA
http://www.tentecwiki.org
Mike Schatzberg wrote:
> Hello Orion II Fans: To the left of the VFO A and VFO B frequency displays, 
> are the letters A and B.  Letter A is highlighted, and letter B, below it,  
> is not. What is the significance of the highlighting for letter A? Thank you 
> for your reply. 73, MikeW2AJI
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>   
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