____________
LaTeX provides almost any mathematical symbol you're likely to need. The commands for generating them can be used only in math mode. For example, if you include `$\pi$' in your source, you will get the symbol "pi" in your output.
\pm \sqcap \rhd \mp \sqcup \unlhd \times \vee \unrhd \div \wedge \oplus \ast \setminus \ominus \star \wr \otimes \circ \diamond \oslash \bullet \bigtriangleup \odot \cdot \bigtriangledown \bigcirc \cap \triangleleft \dagger \cup \triangleright \ddagger \uplus \lhd \amalg
\leq \geq \equiv \models \prec \succ \sim \perp \preceq \succeq \simeq \mid \ll \gg \asymp \parallel \subset \supset \approx \bowtie \subseteq \supseteq \cong \Join \sqsubset \sqsupset \neq \smile \sqsubseteq \sqsupseteq \doteq frown \in \ni \propto \vdash dashv\leftarrow \longleftarrow \uparrow
\leftarrow \longleftarrow \uparrow \Leftarrow \Longleftarrow \Uparrow \rightarrow \longrightarrow \downarrow \Rightarrow \Longrightarrow \Downarrow \leftrightarrow \longleftrightarrow \updownarrow \Leftrightarrow \Longleftrightarrow \Updownarrow \mapsto \longmapsto \nearrow \hookleftarrow \hookrightarrow \searrow \leftharpoonup \rightharpoonup \swarrow \leftharpoondown \rightharpoondown \nwarrow \rightleftharpoons \leadsto
\aleph \prime \forall \infty \hbar \emptyset \exists \Box \imath \nabla \neg \Diamond \jmath \surd \flat \triangle \ell \top \natural \clubsuit \wp \bot \sharp \diamondsuit \Re \angle \backslash \heartsuit \Im \partial \spadesuit \mho
\sum \bigcap \bigdot \prod \bigcup \bigotimes \coprod \bigsqcup \bigoplus \int \bigvee \biguplus \oint \bigwedge
\arccos \csc \ker \min \arcsin \deg \lg \Pr \arctan \det \lim \sec \arg \dim \liminf \sin \cos \exp \limsup \sinh \cosh \gcd \ln \sup \cot \hom \log \tan \coth \inf \max \tanh
\hat{} \tilde{} \check{} \bar{} \breve{} \vec{} \acute{} \dot{} \grave{} \ddot{}