Which instrument is used to cut the cord?

Umbilical scissors are designed specifically to cut the umbilical cord after delivery.

Umbilical Cord Scissors:-

Umbilical scissors are designed specifically to cut the umbilical cord after delivery. These scissors are typically handheld, manual instruments with two thin, very wide blades with large, rounded, blunt tips that slide past each other (i.e., shearing action). The blades are attached to handles with the proximal end conformed as a ring to facilitate holding and operating with the fingers. Both parts are joined by a swivel pin in the center.