In dictionaries:
null hypothesis
Default assumption, no effect observed.
null value
Absence of any data value.
null hypotheses
null character
Terminator for strings in programming.
null pointer
Reference to nonexistent memory location.
null string
null model
In mathematics, for example in the study of statistical properties of graphs, a null model is a type of random object that matches one specific object in some of its features, or more generally satisfies a collection of constraints, but which is otherwise taken to be an unbiasedly random structure.
null set
Set containing no elements whatsoever.
null space
Set of all solutions: Ax=0.
null point
Point where value becomes zero.
null modem
Direct communication between two computers.
null object
(category theory) An object that is both an initial and terminal object.
null mutation
Complete loss of gene function.
null cells
Cells containing no data values.
null result
A result without the expected content; a result that does not support the hypothesis.
null mutant
more...