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What does ES1 refer to in this picture?
That looks like a Bloomberg terminal. And like @Jer said, it would appear to be the symbol for the S&P 500 E-mini index future. Although it doesn't look right all on its own, as it should have a modifier indicating the month (or quarter) of expiry. However, since it appears on a Bloomberg terminal in the image, I checked a source for Bloomberg Symbol Lists and found one of two possibilities for ES1. It is most likely the S&P 500 e-mini future: CME E-Mini Futures  E-Mini S&P 500    ES1 INDEX the only alternative was LIFFE 3 Month Euroswiss   ES1 COMDTY I think the former is far more likely, as the latter has the COMDTY commodity tag instead of INDEX as the tag in the image. Also, it isn't the ESI which pertains to Ethibel Sustainability Indices and something with the Eurozone (also Bloomberg Indices). Here we go! Excerpt straight is from a presentation presentation on charting from a business school PDF see pp.12-13, and appears to be a straight excerpt from September 2007 Bloomberg documentation. I didn't know any other way to imbed it besides taking a screen shot then uploading to imgur. Or of course, see pp.12-13 in the referenced PDF I've attached.  See