LaTeX constants available in ASCIIMathML:

Greek letters: \alpha `\alpha` \beta `\beta` \chi `\chi` \delta `\delta` \Delta `\Delta` \epsilon `\epsilon` \varepsilon `\varepsilon` \eta `\eta` \gamma `\gamma` \Gamma `\Gamma` \iota `\iota` \kappa `\kappa` \lambda `\lambda` \Lambda `\Lambda` \mu `\mu` \nu `\nu` \omega `\omega` \Omega `\Omega` \phi `\phi` \varphi `\varphi` \Phi `\Phi` \pi `\pi` \Pi `\Pi` \psi `\psi` \rho `\rho` \sigma `\sigma` \Sigma `\Sigma` \tau `\tau` \theta `\theta` \vartheta `\vartheta` \Theta `\Theta` \upsilon `\upsilon` \xi `\xi` \Xi `\Xi` \zeta `\zeta`

Operation symbols
TypeSee
\backslash`\backslash`
\times`\times`
\divide`\divide`
\circ`\circ`
\oplus`\oplus`
\otimes`\otimes`
\sum`\sum`
\prod`\prod`
\wedge`\wedge`
\bigwedge`\bigwedge`
\vee`\vee`
\bigvee`\bigvee`
\cup`\cup`
\bigcup`\bigcup`
\cap`\cap`
\bigcap`\bigcap`
 Relation symbols
TypeSee
\ne`\ne`
\le`\le`
\leq`\leq`
\ge`\ge`
\geq`\geq`
\prec`\prec`
\succ`\succ`
\in`\in`
\notin`\notin`
\subset`\subset`
\supset`\supset`
\subseteq`\subseteq`
\supseteq`\supseteq`
\equiv`\equiv`
\cong`\cong`
\approx`\approx`
\propto`\propto`
 Logical symbols
TypeSee
\neg`\neg`
\implies`\implies`
\iff`\iff`
\forall`\forall`
\exists`\exists`
\bot`\bot`
\top`\top`
\vdash`\vdash`
\models`\models`

Grouping brackets

TypeSee
\{`\{`
\}`\}`
\langle`\langle`
\rangle`\rangle`
 Miscellaneous symbols
TypeSee
\int`\int`
\oint`\oint`
\partial`\partial`
\nabla`\nabla`
\pm`\pm`
\emptyset`\emptyset`
\infty`\infty`
\aleph`\aleph`
|\ldots||`\ldots`|
|\cdots||`\cdots`|
|\ ||`\ `|
|\quad||`\quad`|
\diamond`\diamond`
\square`\square`
\lfloor`\lfloor`
\rfloor`\rfloor`
\lceiling`\lceiling`
\rceiling`\rceiling`
 Standard functions
TypeSee
\sin`\sin`
\cos`\cos`
\tan`\tan`
\csc`\csc`
\sec`\sec`
\cot`\cot`
\sinh`\sinh`
\cosh`\cosh`
\tanh`\tanh`
\log`\log`
\ln`\ln`
\det`\det`
\dim`\dim`
\lim`\lim`
\mod`\mod`
\gcd`\gcd`
\lcm`\lcm`
 Arrows
TypeSee
\uparrow`\uparrow`
\downarrow`\downarrow`
\rightarrow`\rightarrow`
\to`\to`
\leftarrow`\leftarrow`
\leftrightarrow`\leftrightarrow`
\Rightarrow`\Rightarrow`
\Leftarrow`\Leftarrow`
\Leftrightarrow`\Leftrightarrow`

Font commands

TypeSee
\mathbf A`\mathbf A`
\mathbb A`\mathbb A`
\mathcal A`\mathcal A`
\mathtt A`\mathtt A`
\mathfrak A`\mathfrak A`

Font command test:

Blackboard bold: `\mathbb{ABCDEFGHIJKLMNOPQRSTUVWXYZ}`

Calligraphic: `\mathcal{ABCDEFGHIJKLMNOPQRSTUVWXYZ}`

Fraktur: `\mathfrak{ABCDEFGHIJKLMNOPQRSTUVWXYZ}`