What does this half cent grade mean?

I sometimes appear to know what I am talking about but I have NO idea what this grade means from PCGS? They just finished grading it today, and it's a coin that my father-in-law gave us. I have just never seen a grade G06BN. Can anyone help me?
1802/0 1/2C Reverse of 1802 US
G06BN
0
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<< <i>As opposed to G06 RD
Or the dreaded BB
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<< <i>Is that considered a good grade? The coin was kind of worn. >>
Any 1802 half cent that gets in a pcgs holder is a good grade. Most 1802s are kind of worn.