Special LaTeX Characters
 
2. LaTeX binary relations
Type Print Type Print
\in             \ni              
 \leq            \geq           
 \ll                \gg             
  \prec             \succ          
    \preceq                \succeq           
\sim            \cong         
 \simeq               \approx           
 \equiv           \supset       
   \subset               \supseteq        
    \subseteq            \supseteq       
    \sqsubseteq            \sqsupseteq       
\smile          \frown        
\perp             \models        
\mid            \parallel      
 \vdash            \dashv         
   \propto          \asymp       
\bowtie        กก  กก  กก
       \sqsubset              \sqsupset       
\Join             กก  

The latter three symbols need the latexsym package.  

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