Why GOLD is XAU/USD
AU is a generic name of gold and X is a term for all metals you can see all metal in forex start with X. So this whole make a abbrivation for gold to trade in this market.
Game is not over Till it's Over
Well now you can see there are many broker who are keeping it name as GOLD only instead of XAU_USD and even i don't have any idea about it but there must be some reason for it.