You can write it in a number of ways, but the easiest is probably \rule{<len>}{<width>} hello where you specify <len> and <width>. Typically, <width> is 0.4pt.
Here is an alternative macro definition that does not take an argument:
\documentclass{article}
\def\blank{\medskip\hrule\medskip}
\begin{document}
Cillum dolore eu fugiat nulla pariatur. Excepteur sint
occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit
anim id est laborum.
\blank
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod
tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam.
\end{document}
The \hrule inserts a horizontal rule that takes up all the available space. A \medskip before and after makes sure there is a little space above and below the rule. You could also use \smallskip or \bigskip for a smaller or bigger space.
Addendum: I like Peter Grill's addition of some ornament in his solution. Here is a \blankwith macro that takes an ornament like in \blankwith{$\clubsuit$}. This macro again relies more on TeX than LaTeX. It puts the ornament slightly lowered in the middle of the line with some space left and right. The line is drawn using \hrulefill.
\def\blankwith#1{\par\nobreak\bigskip
\hbox to \hsize{\hrulefill\kern.5em\lower.5ex\hbox{#1}\kern.5em\hrulefill}
\bigskip}
Best Answer
You can write it in a number of ways, but the easiest is probably
\rule{<len>}{<width>} hello
where you specify<len>
and<width>
. Typically,<width>
is0.4pt
.In a more general setting, see Long underscore in LaTeX.