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
Variable: A letter or symbol used to represent a number or quantities that vary
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
element symbol
element symbol
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.
One or two letters that represent an element are called its chemical symbol. It is a shorthand way to identify an element in the periodic table.
X and y
chemical symbol
The numbers on the periodic table represent the atomic number, which is the number of protons in an atom's nucleus. The letters represent the chemical symbol of each element.
The symbol used to represent a nucleus is "Au", which is a combination of the atomic symbol and mass number.