`\enspace`

& `\quad`

& `\qquad`

Synopsis, one of:

\enspace \quad \qquad

Insert a horizontal space of 1/2em, 1em, or 2em. The em is a length defined by a font designer, often thought of as being the width of a capital M. One advantage of describing space in ems is that it can be more portable across documents than an absolute measurement such as points (see Lengths/em).

This puts a suitable gap between two graphics.

\begin{center} \includegraphics{womensmile.png}% \qquad\includegraphics{mensmile.png} \end{center}

See Spacing in math mode, for `\quad`

and `\qquad`

. These
are lengths from centuries of typesetting and so may be a better choice
in many circumstances than arbitrary lengths, such as you get with
`\hspace`

.