Subscript
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A subscript is a number, figure, or indicator that appears below the normal line of type, typically used in a formula, mathematical expression, or description of a chemical compound. Probably the most famous example of a subscript is the number 2 in the formula for the molecule of water: H2O. Subscripts is also used frequently in mathematics to define starting or final positions; for example, in an equation the following x0 and xf are used to indicate the current and final value of x.
Typographically, subscripts are set using a lower baseline and a smaller size than the other text. For example, to set H2O correctly, the 2 should be about 2/3 the size of the H and the O. This is done automatically in many text editing and word processing programs.
- In HTML and Wiki syntax, subscript text is produced by putting it inside the tags
<sub>and</sub>. - Unicode defines subscript characters such as 0₀ 1₁ 2₂ 3₃ 4₄ 5₅ 6₆ 7₇ 8₈ 9₉ +₊ -₋ *₌ (₍ )₎ (₀ to ₎).
- In TeX's math mode (as used in MediaWiki), subscripts are typeset with the underscore _:
$X_{ab}$produces .
See also
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