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

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 types, many symbols are needed for expressing all

https://www.mathsisfun.com/algebra/symbols.html
Common Symbols Used in Algebra Symbols save time and space when writing. Here are the most common algebraic symbols:

https://math.stackexchange.com/questions/864606/difference-between-%E2%89%88-%E2%89%83-and-%E2%89%85
In mathematical notation, what are the usage differences between the various approximately-equal signs "≈", "≃", and "≅"? The Unicode standard lists all of them inside the Mathematical Operators B

https://science.howstuffworks.com/math-concepts/basic-math-symbols.htm
Math is a language of symbols and equations and knowing the basic signposts is the first step in solving mathematical problems.

https://en.wikipedia.org/wiki/List_of_logic_symbols
In logic, a set of symbols is commonly used to express logical representation. The following table lists many common symbols, together with their name, how they should be read out loud, and the related field of mathematics. Additionally, the subsequent columns contains an informal explanation, a short example, the Unicode location, the name for use in HTML documents, [1] and the LaTeX symbol.

https://mathworld.wolfram.com/Parenthesis.html
A few of these are described below. 1. Parentheses are used in mathematical expressions to denote modifications to normal order of operations (precedence rules). In an expression like (3+5)×7, the part of the expression within the parentheses, (3+5)=8, is evaluated first, and then this result is used in the rest of the expression.

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. [1] While similar to a lowercase X ( x ), the form is properly a four-fold rotationally symmetric saltire. [2]

https://emojipedia.org/check-mark
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.

https://simple.wikipedia.org/wiki/List_of_mathematical_symbols
List of mathematical symbols The list below has some of the most common symbols in mathematics. However, these symbols can have other meanings in different contexts other than math.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_operators
This chapter describes JavaScript's expressions and operators, including assignment, comparison, arithmetic, bitwise, logical, string, ternary and more.

https://math.stackexchange.com/questions/846707/what-does-%E2%88%88-mean
I have started seeing the "∈" symbol in math. What exactly does it mean? I have tried googling it but google takes the symbol out of the search.

https://math.libretexts.org/Bookshelves/Mathematical_Logic_and_Proof/Book%3A_Mathematical_Reasoning__Writing_and_Proof_(Sundstrom)/02%3A_Logical_Reasoning/2.01%3A_Statements_and_Logical_Operators
A logical operator (or connective) on mathematical statements is a word or combination of words that combines one or more mathematical statements to make a new mathematical statement. A compound statement is a statement that contains one or more operators.

https://en.wikipedia.org/wiki/Bracket_(mathematics)
Bracket (mathematics) In mathematics, brackets of various typographical forms, such as parentheses ( ), square brackets [ ], braces { } and angle brackets , are frequently used in mathematical notation. Generally, such bracketing denotes some form of grouping: in evaluating an expression containing a bracketed sub-expression, the operators in

https://wumbo.net/symbols/dot-operator/
The interpunct symbol also referred to as the middle dot, dot product symbol, or center dot is used in math to represent the multiplication operator or the dot product operator.

https://wumbo.net/symbols/approximately/
The approximately symbol (≈) is used in math to indicate that two expressions are approximately equal to each other. Typically, the symbol is used in an expression like this: In plain language, this means that the constant π (pi) is approximately equal to the value 3.14. In reality, the value of the constant π is irrational and continues

https://wumbo.net/symbols/greater-than-or-equal/
The greater than or equal to symbol is used in math to express the relationship between two math expressions. Typically, the symbol is used in an expression like this: a ≥ b In plain language, this expression represents that the variable a is greater than or equal to the variable b.

https://en.wikipedia.org/wiki/Mathematical_operators_and_symbols_in_Unicode
Mathematical operators and symbols are in multiple Unicode blocks. Some of these blocks are dedicated to, or primarily contain, mathematical characters while others are a mix of mathematical and non-mathematical characters. This article covers all Unicode characters with a derived property of "Math". [2] [3]

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://en.wikipedia.org/wiki/Plus_and_minus_signs
The plus sign ( +) and the minus sign ( −) are mathematical symbols used to denote positive and negative functions, respectively. In addition, + represents the operation of addition, which results in a sum, while − represents subtraction, resulting in a difference. [1] Their use has been extended to many other meanings, more or less analogous.

https://wumbo.net/symbols/element-of/
The ∈ (member of) symbol indicates that an expression on the left-hand side of the symbol belongs to or is in the set on the right-hand side of the symbol. Typically the symbol is used in an expression like this: x ∈ R