It is simply a collection or set with operators defined on them. Nothing more, nothing less.
If the structure, with one operator, satisfies the requirements of closure, associativity, identity and invertibility in respect of that one operator, then it is a Group.
A second operator and additional qualities need to be met for it to be a Ring and further conditions are required for a Field.
If you wish to explore the basics, you can look at Group, Ring or Field in Wikipedia but make sure you also put mathematics in your search engine!
It is usually called a set.
expression
A mathematical phrase that contains operations, numbers, or variables is called an algebraic expression. Algebraic expressions consist of constants (numbers), variables (letters representing unknown quantities), and mathematical operations such as addition, subtraction, multiplication, division, and exponentiation. These expressions can be simplified, evaluated, or manipulated using algebraic rules and properties.
A mathematical sentence that contains an equal sign is called an equation
A mathematical statement that contains an equal sign is called an equation.
A calculation that involves one or more mathematical operators is called an expression. An expression can include numbers, variables, and operators such as addition, subtraction, multiplication, and division. It represents a value that can be evaluated or simplified.
A mathematical phrase that can contain ordinary numbers, variables, and operators is called an "algebraic expression." It can include constants (like 3 or 5), variables (like (x) or (y)), and operators (such as +, -, *, or /). For example, (2x + 5 - y) is an algebraic expression that combines these elements.
Each group of variables and numbers separated by operators is called a "term." In mathematical expressions, terms can be combined using operators such as addition, subtraction, multiplication, and division to form larger expressions or equations. Terms can be constants, variables, or products of both.
A calculation that involves one or more mathematical operators is called an expression. An expression can include numbers, variables, and operators such as addition, subtraction, multiplication, and division. In programming or spreadsheet contexts, these calculations often evaluate to a single value based on the defined operations.
A calculation that involves one or more mathematical operators, such as addition, subtraction, multiplication, or division, is called an arithmetic expression. This expression can combine numbers, variables, and operators to produce a result. For example, the expression "F3 plus F4" uses the addition operator to calculate the sum of the values represented by F3 and F4.
vinculum
If you mean the symbols like +, -, etc., those are called "operators".If you mean the symbols like +, -, etc., those are called "operators".If you mean the symbols like +, -, etc., those are called "operators".If you mean the symbols like +, -, etc., those are called "operators".
A mathematical phrase made up of numbers and variables connected by addition or subtraction operators is called an algebraic expression. For example, the expression (3x + 5 - 2y) consists of the variables (x) and (y), along with the constants 3, 5, and -2, combined using addition and subtraction. Algebraic expressions do not include equality signs or inequalities.
Set
It is usually called a set.
expression
its called an expression