plural of null character

(computing) A control character with the value zero and no visual representation.

(set theory) The sign ∅, associated with empty sets.

plural of null pointer

(category theory) An object that is both an initial and terminal object. / (object-oriented programming) An object that does nothing and is used instead of using a null.

plural of null object

ornamental turned work resembling beads strung on a rod

plural of null set

plural of null anaphora

A result without the expected content; a result that does not support the hypothesis.