anual/encoding.html#content-characters">view current version</a>.
</div>
<div id="content-characters" class="section level2">
<h2><span class="header-section-number">1.1</span> Content Characters</h2>
<p>The content of a Stan program must be coded in ASCII. All identifiers
must consist of only ASCII alpha-numeric characters and the underscore
character. All arithmetic operators and punctuation must be coded in
ASCII.</p>
<div id="compatibility-with-latin-1-and-utf-8" class="section level3 unnumbered">
<h3>C