Can you please explain what are all possible versions of S&P 500 option tickers and VIX option tickers?
My options historical data is from 2006 to 2013 and I can see something like VIXAB, VIXAC, ..., VIXWY (is this a VIX option?).... and also 130213C00010000,VIX.XO for the later years, but I don't know what is the general (exact) convention. I just need the exact tickers to look for S&P 500 and VIX options. There are some sources online but sometimes they differ, so I am not sure. Thank you in advance.