What is xau

Last updated: April 1, 2026

Quick Answer: XAU is the ISO 4217 currency code representing one troy ounce of gold, used in forex and commodity markets to quote gold prices, typically denominated in US dollars as XAUUSD.

Key Facts

Overview

XAU is the ISO 4217 currency code for gold bullion, specifically one troy ounce of precious metal. In global financial markets, XAU serves as the standard way to quote and trade gold, making it essential for investors, traders, and financial professionals who deal with precious metals.

Understanding the Symbol

The XAU symbol follows the ISO 4217 standard for currency and precious metal codes. The 'X' prefix in ISO codes specifically designates precious metals, distinguishing them from standard currency codes. This system ensures clear communication across international financial markets, preventing confusion between different commodities and currencies.

Troy Ounce Measurement

Gold in commodity markets is measured in troy ounces, not standard avoirdupois ounces. One troy ounce equals approximately 31.1 grams, which differs from a standard ounce (28.35 grams). This distinction is crucial because gold prices are universally quoted per troy ounce, making troy ounces the standard measurement across the precious metals industry worldwide.

Trading and Market Use

XAU is primarily traded in forex markets as XAUUSD, representing the price of one troy ounce of gold in US dollars. Major financial institutions, central banks, and individual investors monitor XAU prices as an indicator of economic health, inflation expectations, and safe-haven demand. Gold typically increases in value during times of economic uncertainty or high inflation.

Factors Affecting XAU Prices

Gold prices fluctuate based on numerous factors including US dollar strength, interest rates, geopolitical tensions, inflation rates, and overall investor sentiment. When the US dollar strengthens, gold typically becomes more expensive for international buyers, potentially reducing demand. Conversely, during economic crises or inflation concerns, investors often increase gold purchases as a store of value.

Related Questions

What is the difference between XAU and XAUUSD?

XAU is the commodity code for gold, while XAUUSD is a currency pair showing the price of XAU (gold) in US dollars. XAUUSD is how gold prices are typically quoted in forex markets.

Why is gold measured in troy ounces?

Troy ounces are the historical standard for precious metals dating back centuries. The system was established in Troyes, France, and became the universal standard for trading gold, silver, and other precious metals.

How do I trade XAU gold?

XAU can be traded through forex brokers, commodity exchanges, ETFs, or by purchasing physical gold. Most retail traders access gold trading through forex platforms trading the XAUUSD currency pair.

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Sources

  1. Wikipedia - Gold as an Investment CC-BY-SA-4.0
  2. Wikipedia - ISO 4217 Currency Codes CC-BY-SA-4.0