nameless dagger
Weapon of Rider of the Fate series.
From Type Moon Wikia: "Rider fights with a low-risk and high-return type of warfare that isn't fixated on the methods used to win. She fights mainly with a Nameless Dagger in close combat that is more likely to be called a "nail" rather than a "dagger." It is attached to a long chain that can restrain and immobilize targets that she pierces. It is not suited to short-range battles, instead best utilized as a thrown weapon from a distance. It is not a Noble Phantasm, and while its origin is unknown, it is thought to be a weapon that reflects her inner character."