Subscript (noun)

A character, symbol, or number written or printed slightly below the normal line of text.

Origin:

Derived from the latin word "subscriptus", meaning "written below".

Examples:

1. The subscript in H2O represents the number of atoms of hydrogen.
2. The chemical formula uses subscripts to indicate the ratio of atoms.
3. The equation used subscripts to distinguish between different variables.
4. The subscript notation is used to indicate the power to which a number is raised.
5. The subscript in a mathematical equation indicates the index of an array or a matrix.