What is an Index?

Index is a parameter to judge the health of system.

for e.g. NY Stock Exchange has it's own index for listed shares.

Another Example is LME is world know index to know price of Metals worldwide.

Can you be more specific and this is in refernce to what?

Index can also be described as some thign at the end of a book

[System detected duplicate content; converted into image. Thanks.]

Was this what you were lookign for or somehtign else