symbol denoting the empty set
Factsheet
Unicode character ∅
Unicode character ∅
Wikipedia
en.wikipedia.org › wiki › Null_sign
Null sign - Wikipedia
June 13, 2025 - The null sign (∅) 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. The symbol ∅ is available at Unicode point U+2205.
Wikipedia
en.wikipedia.org › wiki › Null_symbol
Null symbol - Wikipedia
June 28, 2025 - Null symbol may refer to: Null character, U+0000 <control-0000> , Null sign (∅), the empty set · Null (SQL) (ω), a special marker and keyword NULL in SQL · Empty string (λ, Λ, or ε), in formal language theory · Null (disambiguation) Ø (disambiguation) Dotted circle – Non-significant ...
notation - What is the mathematical symbol for "nothing"? - Mathematics Stack Exchange
I want to define a random variable $X$ which takes the values from the set $\{0,1\}$. The probability of $X = 0$ is 0.4 and the probability of $X = 1$ is also 0.4. I want $X$ to take a null value with the remaining probability of $0.2$. The question is, what should be the right symbol to denote ... More on math.stackexchange.com
How can I type the null sign?
How can I type the null sign, the symbol looking like a zero with a slash through it. More on learn.microsoft.com
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June 20, 2020What letter is the empty set symbol ∅ to you?
Those are all distinct symbols, as you can see here: Greek Phi — capital: Φ, lowercase: φ/ϕ "slashed O" — capital: Ø, lowercase: ⊘ Empty set: ∅ More on reddit.com
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July 31, 2024How do you write the null symbol or slashed zero without confusion in Norwegian/Danish?
The null set symbol was actually inspired by the Danish letter. At any rate, I can't imagine that it'd be more confusing than the cross product symbol and the letter x. More on reddit.com
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May 12, 2016Wumbo
wumbo.net › symbols › empty-set
Empty Set Symbol (∅)
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.
Piliapp
piliapp.com › symbols › null-sign
∅ Null Sign
Philosophical Implications: The ... Unlike the Union Symbol (∪) and Intersection Symbol (∩), which combine sets, the Null Sign (∅) indicates the absence of elements....
Top answer 1 of 3
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This is sufficiently rare, and handled in sufficiently many different ways, that you should always state explicitly how you're treating it. In my experience, the most common symbols are:
, 
, 
or similar on the more computer-sciencey side, and
or 
on the more logicy side.- Note that "
" is also used to denote contradiction, and "
" is also used as a predicate to denote "is undefined" or "doesn't halt" with "
" denoting "is defined"/"does halt."
- Note that "
But again, I'd explicitly state which you're using - although admittedly multiple of these would almost certainly make it obvious from context.
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You can use some kind of Many-valued logic, but you said you want to put it simply. In SQL there is 3-valued logic with "null"/"unknown", for example.
HotSymbol
hotsymbol.com › symbol › empty-set
∅ Empty Set copy and paste - HotSymbol
🤩 Copy and paste ∅ Empty Set symbol with unicode, HTML, CSS, HEX, Alt, shortcodes with just one click.
Unicode Compart
compart.com › en › unicode › U+2400
“␀” U+2400 Symbol For Null Unicode Character
U+2400 is the unicode hex value of the character Symbol For Null. Char U+2400, Encodings, HTML Entitys:␀,␀, UTF-8 (hex), UTF-16 (hex), UTF-32 (hex)
Top answer 1 of 2
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Another suggestion is you can also type: Alt + 0216.
Best regards,
Dan
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Hi! I'm Dan! An Independent Advisor and also a Microsoft user for several years. I'll be more than happy to assist you today!
Method 1:
The ∅ symbol can be entered by going into "Symbols", choose "Mathematical Characters" and from the dropdown "Subset".
Method 2:
Type 2205 and then press "Alt + X".
I hope this information is helpful. Please keep me updated on the status of this issue. If you have any more questions, feel free to ask and I will be glad to assist you.
Standard Disclaimer: There are links to non-Microsoft websites. The pages appear to be providing accurate, safe information. Watch out for ads on the sites that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the sites before you decide to download and install it.
Best regards,
Dan
Cuemath
cuemath.com › algebra › empty-set
Empty Set - Definitions, Properties, Examples | Null Set
A set that does not contain any element is called an empty set or a null set. An empty set is denoted using the symbol '∅'. It is read as 'phi'. Example: Set X = {}. It is also called a void set or null set.
Reddit
reddit.com › r/mathematics › what letter is the empty set symbol ∅ to you?
r/mathematics on Reddit: What letter is the empty set symbol ∅ to you?
July 31, 2024 - So, the empty set symbol ∅ its own thing, it's not phi, it's not a slashed O... it's an empty set symbol.
Flaticon
flaticon.com › free-icons › null
Null Icons & Symbols
1 week ago - 284 null icons. Vector icons in SVG, PSD, PNG, EPS and ICON FONT
Teflpedia
teflpedia.com › Null_symbol
Null symbol - Teflpedia
May 6, 2025 - The null sign or null symbol is a symbol used in the field of linguistics to denote zero (linguistics), an empty set.
Adobe Stock
stock.adobe.com › search
Null Symbol Images – Browse 23,218 Stock Photos, Vectors, and Video | Adobe Stock
August 21, 2025 - Search from thousands of royalty-free Null Symbol stock images and video for your next project. Download royalty-free stock photos, vectors, HD footage and more on Adobe Stock.
Quora
quora.com › What-is-the-name-of-the-symbol-Which-we-use-for-empty-set-in-mathematics
What is the name of the symbol ∅ ? Which we use for empty set in mathematics. - Quora
Answer (1 of 3): It's just called the empty set. It's LaTeX code is \emptyset (\emptyset) or \varnothing (\varnothing), which is just a typographical variation that many people prefer aesthetically.
SYMBL
symbl.cc › homepage › unicode › blocks › basic latin › c0 controls › null
Null symbol meaning, copy and paste unicode character - (◕‿◕) SYMBL
January 29, 2025 - It's the first symbol in Unicode and ASCII taking the zeroth position. Null is used in various ways, such as indicating the end of lines or data blocks, filling space between data elements, preventing the processing of data after a certain stage, etc.
Symbol Wiki
symbol-thing.fandom.com › wiki › Null
Null | Symbol Wiki | Fandom
Null is literally nothing. Its hexadecimal code is U+0000. There is no use currently known for the symbol. Nul This symbol is the first ever unicode.
Reddit
reddit.com › r/nostupidquestions › how do you write the null symbol or slashed zero without confusion in norwegian/danish?
r/NoStupidQuestions on Reddit: How do you write the null symbol or slashed zero without confusion in Norwegian/Danish?
May 12, 2016 -
So in math, I've always been taught to write my zeros with a small slash through them to differentiate between them and the letter O. Also, there's the symbol "∅" which denotes the empty set and is called the 'null sign'. If you are doing math in Norwegian or Danish, how do you avoid confusing the letter ∅ with these symbols?
Top answer 1 of 2
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The null set symbol was actually inspired by the Danish letter. At any rate, I can't imagine that it'd be more confusing than the cross product symbol and the letter x.
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AFAIK, letters used in maths are either from the standard English alphabet or the Greek alphabet (with some exceptions), so I'd very much doubt you'd ever see a Norwegian/Danish character in there Letters are fairly rare occasions in everyday maths anyway so it's very rare that it'd come up The majority of the world does not use a null sign, but instead just writes the number 0.
TechTarget
techtarget.com › whatis › definition › data-set
What is a null set in mathematics?
[ "row-frzi_7bar_4cbg", "00000000-0000-0000-AF08-C339B5581012", 0, 1698955938, null, 1698955938, null, "{ }", "172653", "375", "Nitrogen dioxide (NO2)", "Mean", "ppb", "UHF34", "203", "Bedford Stuyvesant – Crown Heights", "Annual Average 2011", "2010-12-01T00:00:00", "25.30", null ]
Pinterest
pinterest.com › explore › home decor
Math Symbol: Null
September 15, 2024 - In mathematics, the null symbol is used to represent the empty set.
Quora
quora.com › What-is-the-name-of-the-symbol-used-for-expressing-empty-sets
What is the name of the symbol used for expressing empty sets? - Quora
Answer: It’s called the “empty set symbol.” I wish I could give you some cool name like “octothorpe”, but it was based on the letter Ø from Danish, where it is a Close-mid front rounded vowel and “the name of this letter is the ...