https://emojipedia.org/check-mark
A thick check mark / tick displayed on some platforms in a handwritten style. Generally displayed in black. Commonly used in lists to signify completed tasks or verification of a statement of fact. Previously shown in red on Samsung and green on Google and Microsoft . Note: this emoji is not supported in Twitter / X names, to minimize confusion

https://emojipedia.org/upside-down-face
Upside-Down Face. A classic smiley, turned upside down. Implemented as a flipped version of 🙂 Slightly Smiling Face on most platforms. Commonly used to convey irony, sarcasm, joking, or a sense of goofiness or silliness. Its intent can be similar to the bemused Oh well! of 🤷 Person Shrugging or the shruggie emoticon, ¯\_ (ツ)_/¯.

https://math.stackexchange.com/questions/864606/difference-between-%E2%89%88-%E2%89%83-and-%E2%89%85
In LaTeX it is coded as \cong. ∼ ∼ is a similarity in geometry and can be used to show that two things are asymptotically equal (they become more equal as you increase a variable like n n ). This is a weaker statement than the other two. In LaTeX it is coded as \sim. ≃ ≃ is more of a grab-bag of meaning.

https://emojipedia.org/face-with-raised-eyebrow
A yellow face with a flat, neutral mouth and furrowed eyebrows, its left raised higher than its right. Conveys a wide variety of sentiments, including suspicion, skepticism, concern, consideration, disbelief, and disapproval. Its expression has notably been likened to the signature look of comedian Stephen Colbert as well as actor/wrestler

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://en.wikipedia.org/wiki/%E2%88%82
The character ∂ (Unicode: U+2202) is a stylized cursive d mainly used as a mathematical symbol, usually to denote a partial derivative such as / (read as "the partial derivative of z with respect to x"). It is also used for boundary of a set, the boundary operator in a chain complex, and the conjugate of the Dolbeault operator on smooth differential forms over a complex manifold.

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.

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://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.mathsisfun.com/symbols.html
Symbols save time and space when writing. Here are the most common mathematical symbols:

https://simple.wikipedia.org/wiki/Equals_sign
The symbol used to say when items are not equal is "≠" (slashed equal sign). [1] There are several symbols that can be used to say items are " approximately the same," "similar to" or "about equal." Some of these symbols include: "≈" (two tildes or wavy lines, often used for "approximately equal") [1] "⩰" (two tildes above two lines)

https://wumbo.net/symbols/perpendicular/
In geometry, the perpendicular symbol is used to show that two lines are perpendicular to each other. Visually, the symbol is made up of two lines that form a perpendicular angle.

https://en.wiktionary.org/wiki/%E2%8A%97
Please help out and add a definition, then remove the text {{ rfdef }}. ( computing, dated) ISO 2047 symbol for Shift Out. ( electricity) indicating lamp. ( architecture) down light. ( logic) intensional conjunction, as in some relevant logics.

https://en.wikipedia.org/wiki/Sign_(mathematics)
Sign of a number. Numbers from various number systems, like integers, rationals, complex numbers, quaternions, octonions, ... may have multiple attributes, that fix certain properties of a number.A number system that bears the structure of an ordered ring contains a unique number that when added with any number leaves the latter unchanged. This unique number is known as the system's additive

https://sphweb.bumc.bu.edu/otlt/MPH-Modules/PH717-QuantCore/PH717_BasicQuantitativeConcepts/PH717_BasicQuantitativeConcepts2.html
There are three commonly used means of indicating multiplication. The symbol " x ", e.g., 5 x 6 = 30. Note that this symbol is generally avoided in algebraic equations because of the common use of "x" to indicate an unknown quantity. The symbol " * ", e.g., 5 * 8 = 40. The use of the asterisk to indicate multiplication is commonly used in

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://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://math.stackexchange.com/questions/3958074/what-is-the-meaning-of-%E2%8A%8A
3 Answers. Short answer: A B A ⊊ B means that A A is a subset of B B and A A is not equal to B B. Long answer: There is some confusion on mathematical textbooks when it comes to the symbols indicating one set is a subset of another. It's relatively clear what the symbol " ⊆ " means. This symbol is more or less universally understood as the

https://www.thepunctuationguide.com/slash.html
The one inarguably acceptable use of the slash in formal writing pertains to poetry. The slash, with one space on either side, indicates a line break. In choosing your path in life, you might consider the words of Robert Frost, in his poem "The Road Not Taken": "I took the one less traveled by, / And that has made all the difference.".

https://www.dictionary.com/e/emoji/upside-down-face-emoji/
The upside-down face emoji, sometimes known as the upside-down smiley face, has several meanings depending on the context and personality of the user. It can indicate silliness, sarcasm, irony, passive aggression, or frustrated resignation. Outside of these, this emoji can be used for even still more ambiguous emotions.