How to use underscore(A_B) in LaTeX?

The underscore character is usually used to write a subscript in Math mode in latex, so it is not possible to print this character directly in the document.

So you need to use the \textunderscore command to print this or you can use \_ this too. And you can use this command in either math mode or text mode.

SymbolUnderscore
Type of symbolCharacter
Package (requirement)No
ArgumentNo
Latex command\textunderscore
ExampleA\textunderscore B → A_B
\documentclass{article}
\begin{document}
  % Use underscore in text mode
  word\textunderscore one \textunderscore two \\[6pt]
  A\textunderscore B\textunderscore C \\[6pt]
  Latex\textunderscore Help\\[8pt]
  % use \_ to print underscore
  word\_one\_two\\[6pt]
  Samp\_Dist\_Corr
\end{document}

Output :

Use underscore in latex.

Below are some examples using Math mode. In the case of Math Mode, you will see some differences in the output.

\documentclass{article}
\begin{document}
  % Use underscore in math mode
  \[ word\textunderscore one \textunderscore two \]
  \[ A\textunderscore B\textunderscore C \]
  \[ Latex\textunderscore Help \]
  % use \_ to print underscore
  \[ word\_one\_two \]
  \[ Samp\_Dist\_Corr \]
\end{document}

Output :

Use underscore in math mode in latex.

Using tt font with underscores

You can use tt font to make the output look better. For this, you can use \texttt{arg}, the default command of latex.

And you can use this command in either math mode or text mode.

\documentclass{article}
\begin{document}
  % use tt font
  \texttt{word\_one\_two}\\[6pt]
  \texttt{Samp\_Dist\_Corr}\\[6pt]
  \texttt{Latex\_Help}
\end{document}

Output :

use underscore with tt font in latex.

If you want to use more fonts then the best practice would be if you use it {\_}. It is comfortable with all fonts.

\documentclass{article}
\begin{document}
   \[ \texttt{Latex{\_}help} \]
   \[ \texttt{Word{\_}One{\_}Two} \]
\end{document}

Output :

Use underscore in output.

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