ASX codes, also referred to as ticker symbols, are unique strings of letters—typically consisting of three or four characters—assigned to companies, real estate investment trusts, exchange-traded funds, and financial instruments listed on the Australian Securities Exchange. These standardized codes provide a concise, universally recognized method for investors, brokers, and market data systems to identify securities quickly, track intraday price movements, execute buy and sell orders, and monitor historical chart performance across domestic and international trading terminals.