null
/nลญl/
adjective
- Having no legal force; invalid. render a contract null and void.
- Of no consequence, effect, or value; insignificant.
- Amounting to nothing; absent or nonexistent. a null result.
Wikipedia
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Null (mathematics) - Wikipedia
February 4, 2026 - In mathematics, the word null (from German: null meaning "zero", which is from Latin: nullus meaning "none") is often associated with the concept of zero, or with the concept of nothing.
Merriam-Webster
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NULL Definition & Meaning - Merriam-Webster
1 month ago - Null often pops up in legal and ... in the phrase "null and void." In mathematics, it is sometimes used to mean "containing nothing"; for example, the set of ......
CK-12 Foundation
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What is a null set in maths? - Symbol & Definition | CK-12 Foundation
September 11, 2025 - In mathematics, a null set, also known as an empty set, is a set that contains no elements. It is denoted by the symbol @$\begin{align*}\emptyset\end{align*}@$ or @$\begin{align*}\{\}\end{align*}@$. For example, the set of all integers that are both even and odd is a null set, because no integer ...
soft question - In mathematics is null == zero? - Mathematics Stack Exchange
Once we start simplifying by assuming ... that NULL == 0) :) $\endgroup$ ... $\begingroup$ @flindeberg, yeah let's leave that rabbit hole alone. You are right about the value of precision in notation... When we are comparing apples and apples (sets and sets) then we are being absolutely precise and there is no need to quibble about meanings. I guess my point is just that it can be useful to discuss mathematical objects using ... More on math.stackexchange.com
How can I differentiate between "zero" and "null"?
Not a native, but we have the same "problem" in German (I am a software developer, so I often have to use NULL in my work day), so I would like to give my two cents anyway. I pronounce the number just like a normal person would, with German pronounciation. And the NULL value I pronounce with an English pronounciation. For everyone else (ie, everyone who doesn't work in IT) it really doesn't matter. 0 is 0 and they have no concept of what a NULL value might be anyway. More on reddit.com
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3
December 16, 2020What is the difference between No Solution and Null Solution?
I could be missing something, but I've personally never heard of a "null solution" in this context. Does you source material define it? More on reddit.com
5
3
August 12, 2023Why do we consider the null set to be a subset of all sets? Could we define it otherwise?
If you have an apple, an orange, and a kiwi and you tell me to take any subset of them that I want, it's a valid choice to take none of them. More on reddit.com
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April 13, 2024How do you define a null set?
The null set is the set containing zero elements. So, any set containing no elements is defined to be the null set.
study.com
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Null Set Definition, Properties & Examples - Lesson | Study.com
What is a null set example?
A null set would be: { }. This is simply a set that contains no elements. The brackets indicate a set and since there are no elements listed within, the set is empty.
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Null Set Definition, Properties & Examples - Lesson | Study.com
What is a null set called?
A null set is also called an empty set. These terms are used interchangeably to describe a set that contains no elements.
study.com
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Null Set Definition, Properties & Examples - Lesson | Study.com
Videos
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The Empty Set or the Null Set , Intermediate Algebra , Lesson 27 ...
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Null Set or Empty Set : Sets | Mathematics | AP&TS - YouTube
Cambridge Dictionary
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NULL | definition in the Cambridge English Dictionary
6 days ago - NULL meaning: 1. having no legal force: 2. with no value or effect: 3. (of a set or matrix) containing nothingโฆ. Learn more.
Top answer 1 of 4
4
The distinction between the empty set 
and the number 
is similar to that between NULL and ZERO. For example, the set of real solutions (or informally "the solution") to 
is 
, but the solution to 
is 
.
2 of 4
4
In my mind there is no need for a concept like NULL in mathematics if you think of NULL as in NULL-pointers.
NULL in this sense is a technical necessity because you cannot un-define a variable: Once a variable has been assigned a value, a certain bit of memory is reserved for this variable and this memory is marked as re-usable only if the variable goes out of scope (simplified speaking).
You cannot say "The variable with this name doesn't exist anymore." without letting it go out of scope, because that would make language interpretation much more complicated without many benefits. Therefore, to indicate that the value of the variable has no meaning, one uses NULL.
What NULL stands for in the end depends upon the programming language: In some it is a special keyword, but in some it is also just a different name for the integer 
.
You can assign an arbitrary value to NULL in mathematics as mentioned in the other replies (
, 
, etc.) but as mathematics has nothing to do with memory allocation there is really no need for such a thing as NULL.
Study.com
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Null Set Definition, Properties & Examples - Lesson | Study.com
July 7, 2016 - The term null means to have no value. The definition of the null set hinges on this definition of null. Sometimes the null set is called the empty set as the sets contain no elements.
Encyclopedia Britannica
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Null set | mathematics | Britannica
April 20, 2026 - It is symbolized by $\Lambda$ or $\emptyset$. The term "null" itself originates from Latin and means "not any". In mathematics, it signifies a complete absence, such as a set with zero members.
Dictionary.com
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NULL Definition & Meaning | Dictionary.com
Null means having no value; in other words null is zero, like if you put so little sugar in your coffee that itโs practically null. Null also means invalid, or having no binding force. From the Latin nullus, meaning "not any," poor, powerless null is not actually there at all.
Cuemath
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Empty Set - Definitions, Properties, Examples | Null Set
This further means that every element in the empty set (actually none) belongs to any set. Hence, an empty set is a subset of every set. Yes, โ
is an empty set. An empty set does not contain any elements. Most often the special symbol โ
is used to denote an empty set. An empty set or a ...
Quora
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What exactly is NULL? - Quora
Answer (1 of 25): It means nothing. Most literally. It means that it has no meaning. It can best be understood when dealing with dates and numbers. Alpha-numeric NULL is awkward and not really accurate, as it differentiates between a blank string ...
ScienceDirect
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Null - an overview | ScienceDirect Topics
In most applications, we want to test for a difference, starting with the null hypothesis, symbolized H0, that our sample is not different (hence, โnullโ) from known information. (The hypothesis to be tested must be based on the known distribution, in this case, of the established healing ...
SOSM
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The Real Meaning of โNullโ: Explained in Simple Words 2025
November 4, 2025 - Discover what โnullโ means in programming, math, and everyday life. Simple explanation, expert insight, and practical examples inside!
Wikipedia
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Null - Wikipedia
2 weeks ago - Null-subject language, a language ... is joined to the predicate without overt marking of this relationship. Null (mathematics), a zero value in several branches of mathematics...
YourDictionary
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Null Definition & Meaning | YourDictionary
A null result. ... Of or relating to a set having no members or to zero magnitude. ... A non-existent or empty value or set of values. ... An instrument reading of zero. ... Zero; nothing. ... Something that has no force or meaning. ... (computing) The ASCII or Unicode character (โ), represented ...
Wikipedia
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Null sign - Wikipedia
April 23, 2026 - The null sign (โ
) is a symbol often used in mathematics for denoting the empty set. The same letter in linguistics represents zero, the lack of an element. It is commonly used in phonology, morphology, and syntax.
Wordnik
wordnik.com โบ words โบ null
null - definition and meaning
adjective (Computers) Unassigned or meaningless; -- a special value given to variables, especially pointers or logical variables, indicating that it is meaningless and cannot be used in computation.
Wikipedia
en.wikipedia.org โบ wiki โบ Empty_set
Empty set - Wikipedia
April 23, 2026 - In mathematics, the empty set or void set is the unique set having no elements; its size or cardinality (count of elements in a set) is zero. Some axiomatic set theories ensure that the empty set exists by including an axiom of empty set, while ...
Reddit
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r/norsk on Reddit: How can I differentiate between "zero" and "null"?
December 16, 2020 -
Both in norwegian are "null", but I think they don't have the same meaning. For example, in programming, writing 0 is not the same as writing null.
Top answer 1 of 5
11
Not a native, but we have the same "problem" in German (I am a software developer, so I often have to use NULL in my work day), so I would like to give my two cents anyway. I pronounce the number just like a normal person would, with German pronounciation. And the NULL value I pronounce with an English pronounciation. For everyone else (ie, everyone who doesn't work in IT) it really doesn't matter. 0 is 0 and they have no concept of what a NULL value might be anyway.
2 of 5
3
This is a problem when talking about code in Norwegian. You could say "tom", but then again "empty" is also a pseudo-value in many languages. I find I tend to say "tom null", to differentiate it from the zero "null", but I recognize that this is neither entirely accurate, nor does it roll off the tongue. As u/knoberation mentioned, "nullverdi" is also an option. Although zero is technically a "verdi" (value), you woldn't use the term "nullverdi" for zero, so it's reasonably unambiguous.
Piliapp
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โ
Null Sign - PiliApp
Philosophical Implications: The ... Unlike the Union Symbol (โช) and Intersection Symbol (โฉ), which combine sets, the Null Sign (โ
) indicates the absence of elements. It is unique in that it is a subset of every set, including itself....
Wumbo
wumbo.net โบ symbols โบ empty-set
Empty Set Symbol (โ
)
The 0 (zero) symbol is used in math to represent the number zero or nothing. ... An empty set, also called the null set, is respresented as a zero with a diagonal line through it or as an empty pair of curly braces.