Le croissant du ange is a pair of weapons Margaret uses in No More Heroes 2: Desperate Struggle.
The weapon's name is French standing for The Crescent of the Angel (the correct French spelling being "Le croissant de l'ange"). They are both tungsten alloy scythes with crescent edges and anti-materiel Barrett M82 rifles sans scope in the polehandles, decorated with an angel's wing motif handle grip on the rifle's barrel and muzzle.
The gun part uses highly damaging 12.7 x 99 mm hollow-point bullets. Margaret suffers heavy recoil when firing due to the high caliber of the bullets and awkward positioning - rifles under the arms rather than against the shoulder, and standing. But to counter this potential weakness, she instead uses them to her advantage. Evidently, when she fires her first shot, she will do a quick ballet twist on the recoil and deliver the second shot before reloading, thereby repeating the cycle until her enemies gets shot to death.
Margaret also has superior control over the blades of her scythes. She is able to swing her scythes in unison with ease, perform flips with them and even break the tiles of the floor with the blade of her scythes when charging down from a high area.