icon meaning ?

when visiting a member's page http://www.chess.com/members/view/PLAYERNAME#games, what is the meaning of the different icons on the firts column ? 

I noticed same some won games improve by more than 500 pts the rank of a player, like for instance in that case (see image attached). How is it possible ?

Blitz vs. standard.  On a PC you can just rest your cursor on the symbol for a few seconds and the meaning pops up.

thanks... i am on mac :-)

and what about increasing ranking by 5-600 pts in one game ?

You have different ratings for different time controls. The blitz loss to blaze101xx dropped his blitz rating from 859 to 851, then the win against jordanmason increased his correspondence rating from 1467 to 1505.

alright, blitz rating is 851 and standard rating is 1363... I got it, thank you guys :-)