Indices - plural form of Index

An Index is a portfolio of equities that represents a specific sector of a market, or the market as a whole. The value of an index is worked out by considering the prices of the various equities making up the index; as a result, movement in individual stock prices can result in the value of the index as a whole increasing/decreasing. 

i.e DowJones, NasDaq, JSE, Hang Seng