AUS200 is the Australian stock index, NAS100 is the U.S. Nasdaq (GEM) stock index, and SPX500 is the U.S. S&P stock index. If you see it in a private place, AUS200 may also represent the gold futures price tag of an underground institution, because AORD is the standard way of writing the Australian common stock index.

The standard notation for the Nasdaq index is NDX, not NAS, and the following S&P 500 industrial stock index is standard