“Often referred to as the fear index, [the Chicago Board Options Exchange Volatility Index (VIX)] represents one measure of the market’s expectation of volatility over the next 30 day period.”
Wikipedia
“Yesterday’s close of 80.86 was the highest for the VIX, formally known as the Chicago Board Options Exchange Volatility Index, since calculations started in 1990. The indicator climbed as high as 89.53, an intraday record, on Oct. 24.”
Bloomberg