I thought we already explained that. You won't be able to see it because the font that your system is displaying the database info with doesnt have a glyph available for that character (U+E03C) http://decodeunicode.org/en/u+e03c/properties
The HQ symbol a custom symbol that the game uses whenever unicode U+E03C is used. If you copy and paste (or extract from dat files) any text from the game with the HQ symbol, you will see it as a square or question mark when you paste it into another program.
Which database are you talking about? Xivdb.com? I don't even see where you find HQ items in there, I just see that they list HQ data in green next to the normal quality stats. On xivwiki.com I have uploaded the HQ symbol already. You can use File:Hq.png inside double brackets [[ to display the HQ symbol anywhere on xivwiki. Edited, Nov 21st 2013 2:08pm by OnyxFFXI