It is an algebraic variable.
In mathematical equations letters of the alphabet are used to represent numbers. Letters in the beginning of the alphabet, a, b, c...,etc typically represent Constants. Letters at the end, x, y, z..typically represent Unknowns, or variables.
X and y
variable
Variable: A letter or symbol used to represent a number or quantities that vary
variable
A variablẹ
In mathematical equations letters of the alphabet are used to represent numbers. Letters in the beginning of the alphabet, a, b, c...,etc typically represent Constants. Letters at the end, x, y, z..typically represent Unknowns, or variables.
A symbol.
It is a variable
The chemical symbol is one or two letters that represent an element.
They are the symbols for the elements . Often they are some of the letters of the English name.For example, Si means Silicon. Silver cannot be Si as well. Therefore, we use the Latin translation, Argentium, to create Ag.
element symbol
element symbol
X and y
chemical symbol
If you are talking about math then its usually " x " but if that is already use in the expression and you want to use another symbol to represent a DIFFERENT number then you can use y or a or so on.
The letters are a one- or two-letter symbol assigned to each element