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

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