Relation symbols. \leq \geq \ll \gg \equiv \asymp \neq \doteq \subset \supset \subseteq \supseteq \sqsubset \sqsupset \sqsubseteq \sqsupseteq \models \perp \mid \parallel \prec \succ \preceq \succeq \sim \simeq \approx \cong \bowtie \Join \smile \frown \in \ni \vdash \dashv \propto