What is Cumulative Impact Index?

I came across a term as "Cumulative Impact Index". I came to know about it from http://ift.tt/1yqCnSW. It is stated, "publication of 5 International Journal papers, each Journal having a cumulative impact index of not less than 2.0".

I knew of peer-reviewed, but as this term was bit new so surfed web, and visited http://ift.tt/1yqCnT0. But much is not clear. If any one of the learned members may kindly explain me preferably with an example.

Thanking in Advance, Subhabrata Banerjee.