Underscore Symbol

_
Symbol Format Data
_ Code Point
U+005F
SVG
All symbols

Usage

The underscore or low line character is used in typesetting systems to denote a subscript expression. For example, the symbol is typically used in a tex expression like this:

x_1

This input is rendered as the following, placing as subscript.

Related

backward slash

The backward slash symbol "\" is primarily used in computing and programming as an escape character.