How understand stock market digit?

SENSEX 18,15050 .......?

Sensex indicate the overall performance of BSE (Stock Market).First 18,150 point indicate market performance ,green  arrow indicate increase of stock market and 50 indicate how much it increased today. If we deduct 50 point from 18,150 then it is Sensex's yesterday's performance i.e 18,100.If it red with down arrow then sensex performance is negative in comparison with yesterday