u/Hylaw

https://preview.redd.it/o32oj9kwbsyg1.png?width=760&format=png&auto=webp&s=03b7dbaf405421303a88f628406df5275f5164d4

Hi, I'm pretty new to the game and am struggling to make efffective layouts. Hence why I started browsing for layouts and found this one.

However, I cant seem to find what that green icon is in game, can you help me please?

Thank you in advance.