Notation 1.1.5.12. Let $S$ be a set. We will often abuse notation by identifying $S$ with the constant simplicial set $\underline{S}$ of Construction 1.1.5.2. (by virtue of Corollary 1.1.5.11, this is mostly harmless).
$\Newextarrow{\xhookrightarrow}{10,10}{0x21AA}$