Please help me

[ This is my first post here. Sry if i did something wrong! ]

      
This effect seems to be used very often but i couldn't find any tutorial that could help me to achieve it. On the first two icons it isn't that clear but i think the third one shows pretty clearly what i'm looking for.

THX IN ADVANCE!!

ICONS by nialish_icons and vsk_icons
S O L V E D !