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What does ES1 refer to in this picture?
That looks very much like an S&P 500 E-Mini index future.  However, ES1 is a strange symbol.  Futures have the month of expiry encoded in their symbol as well:  http://commodities.about.com/od/understandingthebasics/ss/futurescontract_3.htm For example, the September 2011 future in this series would be ESU1. I'm not very familiar with Bloomberg so perhaps this is the front contract (i.e. the one that's closest to expiry (in the is case the September 2011 one)). Only problem is that prices don't exactly match what CME has (high of 1190 and low of 1186.25, for when this page gets out of date):  http://www.cmegroup.com/trading/equity-index/us-index/e-mini-sandp500.html  - but they are so close I suspect it must be some sort of S&P 500 index future.