Weird Yellow Z on my GW screen.

Well I play GW pretty long and I just noticed this yellow little Z right above my compass in the upper right corner. It is slightly slanted and I was wondering what it is for or what it does.

ANYONE know?

its the streaming update thing. it notifies to the player that ur game is being updated while ur playing. thats wat ive been told by my guildmates.

Ah ok that is a good answer as it only apears entering new areas and arenas. Thx