What is the meaning of Nef?

An extravagant table ornament and container used in the Middle Ages and Renaissance, made in the shape of a ship.

Of a line bundle on a complete algebraic variety over a field: such that the degree of its restriction to every algebraic curve in the variety is non-negative.

vessel, ship

nave

nose

beak

nine

new

boat; ship; watercraft

Heaven, Sky

boat; ship; watercraft

nose

beak

nephew

niece

heaven

Source: wiktionary.org