https://math.stackexchange.com/questions/864606/difference-between-%E2%89%88-%E2%89%83-and-%E2%89%85
$\approx$ is used mostly for the approximate (read: calculated) value of a mathematical expression like $\pi \approx 3.14$ In LaTeX it is coded as \approx. $\cong$ is used to show a congruency between two mathematical expressions, which could be geometrical, topological, and when using modulo arithmetic you can get different numbers that are congruent, e.g., $5 \text{ mod } 3 \cong 11 \text

https://en.wikipedia.org/wiki/Glossary_of_mathematical_symbols
Glossary of mathematical symbols. A mathematical symbol is a figure or a combination of figures that is used to represent a mathematical object, an action on mathematical objects, a relation between mathematical objects, or for structuring the other symbols that occur in a formula. As formulas are entirely constituted with symbols of various

https://wumbo.net/symbols/dot-operator/
The dot operator symbol is used in math to represent multiplication and, in the context of linear algebra, as the dot product operator. Typically, the symbol is used in an expression like this: 3⋅ 5. In plain language, this expression means three multiplied by five. The interpunct symbol also referred to as the middle dot, dot product symbol

https://altcodeunicode.com/alt-codes-math-symbols-operators/
Alt 11007. 2AFF Alt X. N-ary white vertical bar, n-ary Dijkstra choice. &#11007. &#x2AFF. U+2AFF. For more math signs and symbols, see Alt Codes for Math Symbols. For the the complete list of the first 256 Windows Alt Codes, visit Windows Alt Codes for Special Characters & Symbols. How to easily type mathematical operator signs (∃ ∛ ∴

https://www.mathsisfun.com/symbols.html
less than, less than or equal to. 2 < 3. > ≥. greater than, greater than or equal to. 5 > 1. √. square root ("radical") √4 = 2. °.

https://en.wiktionary.org/wiki/%E2%89%88
Eric Weisstein, Wolfram Mathworld, "Approximately Equal": If two quantities A and B are approximately equal, this is written A ≈ B. Synonyms: ~=, ≅. ( topology) Homeomorphic to.

https://www.mathematics-monster.com/symbols/Tilde-Operator.html
Here, the tilde indicates that 3.14 is an approximation of π. To wrap up, the ∼ symbol is versatile and widely adopted in various mathematical contexts. Its usage mainly revolves around the concepts of similarity, equivalence, or approximation. It's an efficient way to convey these concepts without the need for verbose explanations.

https://www.mathsisfun.com/algebra/symbols.html
not equal to. π ≠ 2. < ≤. less than, less than or equal to. 2 < 3. > ≥. greater than, greater than or equal to. 5 > 1. ⇒.

https://wumbo.net/symbols/minus/
The minus symbol is used in math to represent subtraction. Typically, the symbol is used in an expression like this: In plain language, this expression represents 6 minus 5. Note, the code point of this character is different from the hyphen symbol (-) on the keyboard even though they are usually used to mean the same thing. The minus symbol is

https://emojipedia.org/warning
A triangle with an exclamation mark inside, used as a warning or alert. This emoji is used prominently within social media platform BeReal's core time-sensitive "⚠️ Time to BeReal ⚠️" push notification. This notification is shown when being prompted to share a photo of themselves and their immediate surroundings, with this notification

https://math.stackexchange.com/questions/846707/what-does-%E2%88%88-mean
7,770 2 2 gold badges 39 39 silver badges 68 68 bronze badges $\endgroup$ 4. 1 ... $\begingroup$ "contains" and "lies in" are also a very bad words to use here, as it refers to inclusion, not set membership-- two very different ideas. $\endgroup$ - richard1941. Commented Nov 10, 2019 at 3:21.

https://en.wikipedia.org/wiki/Multiplication_sign
The multiplication sign (×), also known as the times sign or the dimension sign, is a mathematical symbol used to denote the operation of multiplication, which results in a product. While similar to a lowercase X (x), the form is properly a four-fold rotationally symmetric saltire.. The symbol is also used in botany, in botanical hybrid names and the heavy goods vehicle industry, to calculate

https://en.wiktionary.org/wiki/%E2%86%94
left or right, leftward or rightward. ( logic) material equivalence; if and only if. ( computing) adjustable in horizontal direction. ( architecture) size in horizontal direction, width.

https://science.howstuffworks.com/math-concepts/basic-math-symbols.htm
Common mathematical symbols are the building blocks of all mathematical functions. Bankrx/Shutterstock. Key Takeaways. The 11 basic symbols essential for writing mathematical equations are the plus (+), minus (-), equals (=), does not equal (≠), multiplication (×), division (÷), greater than (>), less than (<), greater than or equal to (≥), less than or equal to (≤), fraction

https://www.mathsisfun.com/algebra/brackets.html
Brackets are symbols used in pairs to group things together. When we see things inside brackets we do them first (as explained in Order of Operations ). The parentheses group 3 and 2 together, and 6 and 4 together, so they get done first: Without the parentheses the multiplication is done first: With more complicated grouping we can use

https://math.stackexchange.com/questions/4380266/meaning-of-the-symbol-%E2%89%A1
It can mean "is defined to be equal to" (for which another common symbol is := := ). Another meaning is "is identically equal to" (for example we write sin2 x +cos2 x ≡ 1 sin 2. ⁡. x + cos 2. ⁡. x ≡ 1 to emphasize that this equation holds for all x ∈R x ∈ R (actually for all x ∈C x ∈ C as well)). It can also mean congurence as

https://emojipedia.org/check-mark
Application error: a client-side exception has occurred (see the browser console for more information).

https://emojiterra.com/meaning/
Emojis 😃 are small digital images or symbols that express a wide range of meanings and emotions ️ 😣.Also known as pictograms, emojis are now part of our daily communication 📱 and have a significant impact on social media 📷 💬, online messaging 📩, and even in the business world 💼 🌍.. An emoji can have a positive and/or negative meaning or even be ambiguous 🤔 💭.

https://emojipedia.org/exclamation-question-mark
A large red exclamation mark (!) and a large red question mark symbol (?) placed side-by-side (!?). Exclamation Question Mark was approved as part of Unicode 3.0 in 1999 and added to Emoji 1.0 in 2015.

https://math.stackexchange.com/questions/2864497/what-does-%E2%A9%94-mean
In the language "R" the operators "|" and "&" indicate the logical operations OR and AND, but the longer form evaluates left to right examining only the first element of each vector. Source: "Logical operators in R". In the language JavaScript bitwise operators ("|" and "&") treat their operands as a sequence of 32 bits (zeroes

https://emojipedia.org/cross-mark?ref=blog.emojipedia.org
A large red cross mark, displayed in the shape of a letter X and similar to a multiplication sign. Cross Mark was approved as part of Unicode 6.0 in 2010 and added to Emoji 1.0 in 2015.