What's this white symbol?
Forgeman Destroyers [FORD] – Sorrows furnace
That’s a general symbol for the Bandits, and depending on which Human storyline you picked, you learn that it’s actually a throwback to the White Mantle as well.
And they get it from the image of the mursaat from GW1. See the iconic pouldron and chestguard, with the feather wings coming from the back.
http://www.guildwiki.de/gwiki/images/thumb/c/cf/Mursaat_gro%C3%9F.jpg/180px-Mursaat_gro%C3%9F.jpg
Check these out:
http://wiki.guildwars2.com/wiki/White_Mantle
http://wiki.guildwars2.com/wiki/Mursaat
If you want to know more, you could also take a look at the Guild Wars 1 versions of those articles.
If you’re wondering where you saw it before, it’s also on the bandithaunt caverns in Queensdale for example.