The unit N/kg represents the quantity of force per unit mass and is commonly known as the unit of gravitational field strength or acceleration due to gravity. It is also referred to as the unit of weight per unit mass. In this context, N represents Newtons, the unit of force in the International System of Units (SI), and kg represents kilograms, the unit of mass. Therefore, N/kg is a unit of gravitational field strength or acceleration due to gravity.