Others like the plus minus times and division symbols seem to be mere notations on a paper. A B 3791428 AB. First of all if you really mean the symbol it is often used by people to mean the following token is to be treated as an exponent when they have to use straight-line text where no superscripting or subscripting is available.
A collection of elements.
Symbol Symbol Name Meaning definition Example set. The Mathematical symbol is used to denote a function or to signify the relationship between numbers and variables. 4 3 means 4 to the power of 3 or 4 cubed that is 4 4 4. Objects that belong to set A or set B.