VIX (Volatility Index)

wikipedia:VIX is the ticker symbol and the popular name for the Chicago Board Options Exchange's CBOE Volatility Index, a popular measure of the stock market's expectation of volatility based on S&P 500 index options

• Cboe ShortTerm Volatility Index (VIX9DSM), which reflects 9-day expected volatility of the S&P 500 Index,
• Cboe S&P 500® 3-Month Volatility Index (VIX3MSM),
• Cboe S&P 500® 6-Month Volatility Index (VIX6MSM)
• Cboe S&P 500 1-Year Volatility Index (VIX1YSM).