Subscript

[Sarah]

Written below or underneath; as, iota subscript. (See underIota.) Specifically (Math.), said of marks, figures, or letters(suffixes), written below and usually to the right of other lettersto distinguish them; as, a, n, 2, in the symbols Xa, An, Y2. SeeSuffix, n., 2, and Subindex.

[Sarah]

a bunch of CG's brought up by Mexican's who sold crack on the streets to support the members of subscript's CS:S addiction

[Couch Potatoe]

A subscript is a character or string that is smaller than the preceding text and sits at or below the baseline. Subscripts have many scientific applications, including mathematics, computer science, and chemistry.
Below is an example of a math function that uses subscripts to define the Fibonacci sequence:
Fn = Fn-1 Fn−2
The small n is a subscript. When used in the context Fn, it refers to a function evaluated for the value n. The text n-1 and n-2 are also subscripts that define previous values of n in the sequence.
In computer science, subscripts can be used to specify a number system. For example, the decimal or denary number 200 is equal to 11001000 in binary and C8 in hexadecimal. Instead of writing out the full words, you could describe the equality of the three numbers with the following statement:
20010 = 110010002 = C816
Subscripts are also used in chemistry to describe chemical compounds. For example, the molecular structure of water, which includes two hydrogen atoms and one oxygen atom, is commonly written:
H2O
Most modern word processors include a text formatting option that allows you to enter subscript or superscript text. HTML provides the

[Kit]

a word, letter, number, or symbol written or printed just below another word, letter, number, or symbol, usually in a smaller size:

[Vania]

(of a letter, figure, or symbol) written or printed below the line.