The CBOE 0DTE VIX is a new trading product introduced by the Chicago Board Options Exchange (CBOE) in 2023. It is a derivative of the VIX, which is a measure of the implied volatility of the S&P 500 index. The 0DTE (Zero Days to Expiration) VIX is a short-term options contract that expires at the end of the trading day.
VIX is calculated using deritives that expire in 23 to 27 days.
VIX9D is the VIX for the next 9 days. This is why VIX9D is at the top of the BloodHound VIX template chart.