$\begin{Vmatrix}\end{Vmatrix}$
\cdot \ast \star \circ \bullet
$\cdot \ast \star \circ \bullet$
\boxplus \boxminus \boxtimes \boxdot
$\boxplus \boxminus \boxtimes \boxdot$
\oplus \ominus \otimes \oslash \odot
$\oplus \ominus \otimes \oslash \odot$
\circleddash \circledcirc \circledast
$\circleddash \circledcirc \circledast$
\bigoplus \bigotimes \bigodot
$\bigoplus \bigotimes \bigodot$
\Box \blacksquare \diamond \Diamond \lozenge \blacklozenge
$\Box \blacksquare \diamond \Diamond \lozenge \blacklozenge$
\bigcirc \triangle \bigtriangleleap \bigtriangledown
$\bigcirc \triangle \bigtriangleleap \bigtriangledown$
\vartriangle \triangledown \triangleleft \triangleright
$\vartriangle \triangledown \triangleleft \triangleright$
\blacktriangle \blacktriangledown \blacktriangleleft \blacktriangleright
$\blacktriangle \blacktriangledown \blacktriangleleft \blacktriangleright$
纠正：\bigcirc \triangle \bigtriangledown
$\bigcirc \triangle \bigtriangledown$
箭头$I$
\Rrightarrow \Lleftarrow
$\Rrightarrow \Lleftarrow$
\Rightarrow \nRightarrow \Longrightarrow \implies
$\Rightarrow \nRightarrow \Longrightarrow \implies$
\Leftarrow \nLeftarrow \Longleftarrow
$\Leftarrow \nLeftarrow \Longleftarrow$
\Leftrightarrow \nLeftrightarrow \Longleftrightarrow \iff
$\Leftrightarrow \nLeftrightarrow \Longleftrightarrow \iff$
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