what does the plus numbers mean by the game pieces taken?

FancyShoes

I was in this game, I won by resignation. I had 3 major pieces, and my opponent had 5 major pieces. game showed +5 on his name by pieces taken, but he resigned this game. 

 

https://www.chess.com/live/game/2638133689

 

 

Piperose

 

Black 

5x Pawns + B + N = 11pts

White

2x Pawns + B + B + N + R = 16pts

 

Difference of 5 

FancyShoes

thanks. I like your name btw! I hope you like my face!

FancyShoes

maybe one of these days I will learn to play this game