Question: Maple use of symbols

What is the meaning of the "0" in the series expansion

series(x/(-x2-x+1), x = 0); ( this is the Maple command)
                   
              x + x2  + 2 x3  + 3 x4 + 5 x5  + O(x6)  This is the results

This is use in Maple I've seen quite a bit for series. I assume the the series continues on. But I am not sure

Also is there any listing of what some of the symbols that maple uses???
 

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