What is the section variable

[Emad ELsayed]

welcome everybody
I am adding meta property to my forum, but I do not know section variable
I have tried many variables but no results

<meta property="og:title" content="{vb:raw thread.title}"/>
<meta property="og:type" content="article"/>
<meta property="article:section" content=""/>
<meta property="og:site_name" content="{vb:raw $vboptions[bbtitle]}"/>

[Emad ELsayed]

This does not work: $thread[forumtitle]
any help