Backward Slash Symbol (\)

The backward slash symbol is used in computing as an escape character. In the typesetting language the symbol denotes the start of a command or specific symbol. Typically, the symbol is used in an expression like this:

In plain language, the backslash symbol is indicating the start of a TeX command. In this case, the command is the “pi” command and the symbol gets rendered like shown below:

The underscore character is a keyboard character that is used for various poses. In math, the underscore character is used in typesetting systems to denote subscript expressions.

The forward slash operator is used in computing to represent the division operator.

The set union symbol, also called the cup symbol, represents the union operator in set theory.

The cap symbol is used in mathematics as the set intersection operator. It also is used in probability to represent the occurrence of two events.

TeX is a popular typesetting system for authoring technical documents and math expressions.