Symbols next to Characters' Names (HP&Me) - Meanings?

[nightlysparks]

No: HPFGUIDX 40001

I don't know if this has already been brought up, but I was reading 
the FAQs and it seemed like the symbols in JKRs journal were under 
debate as to what they really are.  

I copied down all of them while watching (faithful-obsessive fan that 
I am) and was looking for patterns - I came to a conclusion, a few 
actually:

Obviously, the name is first.

Then there is a coloured in square, or an open circle. I think the 
dark square is if the character is male (except, oddly enough, in the 
case of Neville Longbottom), thus making the circle mean the 
character is female.  

After that, there are symbols of stars, one plain, one in a circle, 
and an "N" in a square. I think simply the star means 1/2 blood 
(Seamus has the star with a circle, but the circle is crossed out, 
making him half blood, as he says), the star with the circle around 
it is pure-blood, and the N with a square around it is muggle born 
(eg. Hermione)

After that, the R,H, S, or G.  Quite obviously, Ravenclaw, 
Hufflepuff, Slytherin, or Gryffindor, with the Gryffindors circled.

If anyone else has other ideas, I'd like to hear them as well, but 
this is what I came up with. 

"nightlysparks"