I saw someone shouting in Gridania yesterday and somehow they were able to use the HQ symbol in their shout... it was an advertisement for his crafting of Vanya HQ I believe.
I wish I knew how he did it...
Just drag an HQ item into the chat window. It will add the name of the item, including the HQ symbol. Then just delete the item name so that all is left is the symbol.
Then how do they do hearts, stars, horseshoes, clovers, and balloons?
Ok, maybe not balloons, but the rest are legit.