Harpe

Harpe is the name of the snake hunter's scythe used by Perseus to kill Medusa, when she was in monstrous Gorgon form. It is considered one of five noble phantasms owned by Perseus. Hermes was the original owner of the scythe, but he lent his winged sandals Talaria and Harpe to Perseus to aid him in his task of bringing Medusa's head.

In Fate/stay night, Harpe was seen as one of weapons inside Gate of Babylon.

Sources: the weapon status screen, translated by Mirror Moon, Fate/hollow ataraxia