What is the difference between NR, TR, GR, PR & SRP for indices?

NR - means Net Return. Net Return indices include dividends after the deduction of withholding taxes.

TR - means Total Return. 

GR - means Gross Return.

Total Return and Gross Return are the same. Both are accumulation indices, meaning they include dividend reinvestment, in addition to tracking price movements.

PR - means Price Return. Price Return indices only consider price movements (capital gains or losses) while the income generated, in the form of interest and dividends, is ignored.
SRP - SuperRatings Pension

SR - SuperRatings