I think that it is chemical formula.
A chemical formula is a representation of a compound using symbols of elements and numbers indicating the ratio of atoms. It shows the types and numbers of atoms present in a compound.
It is an expression.
Chemical compound
Subscript
Scientists call a group of symbols and numbers that stands for a compound a chemical formula. This formula shows the type and number of atoms that make up the compound.
A combination of chemical symbols that show what elements make up a compound and the number of atoms of each element in the smallest unit of the compound is a chemical formula.
The chemical formula of a compound provides information about the elements present in the compound and the ratio in which they are combined. The subscripts in the chemical formula indicate the relative number of atoms of each element in a compound.
The formula of a compound is written using the symbols of the elements present in the compound and subscript numbers to represent the ratio of each element in the compound. The subscript numbers indicate how many atoms of each element are present in a molecule of the compound.
A chemical formula shows the types and numbers of atoms in a compound. To read it, identify the elements and their respective numbers in the formula. The elements are represented by their symbols, and the numbers indicate the ratio of atoms in the compound.
Symbols represent the chemical elements that combine to form a compound in a chemical formula. Each symbol corresponds to a specific element, and their arrangement indicates the ratio of the elements in the compound. For example, in water (H₂O), the symbols H and O represent hydrogen and oxygen, respectively, with the subscript indicating that two hydrogen atoms combine with one oxygen atom.
Compounds can be described using element symbols and numbers
A chemical formula provides information about the types and numbers of atoms in a molecule, but it does not reveal the spatial arrangement of those atoms in the molecule. It is a concise way to represent the composition of a substance using chemical symbols and numerical subscripts.