The full meaning of voting CSI is community support index. It explains the rate in which you are supporting your fellow users. A user should make at least 10 upvotes and above, and the vote should be spread among different users.
That also determines the support you get from steemcurators.
Your Voting CSI should always be from 5% and above and it can be seen in your steemworld page.
Do you know where to see your voting CSI in steemworlds?