Four Leaf Clover

Four Leaf Clover is a perk in Fallout 4 and Fallout 76.

Behind the scenes
Vault Boy's outfit and fighting stance in the perk icon are a reference to the University of Notre Dame's mascot, the Fighting Irish. 

Vierblättriges Kleeblatt Trèfle à Quatre Feuilles Клевер-четырёхлистник