Colon
(Built-in Mathematica Symbol) Colon[x, y, ...] displays as x \[Colon] y \[Colon] ....
Congruent[x, y, ...] displays as x \[Congruent] y \[Congruent] ....
Context
(Built-in Mathematica Symbol) Context[] gives the current context. Context[symbol] gives the context in which a symbol appears.
CounterStyleMenuListing is an option for cells that specifies what counter styles are listed in the Counter popup menu of the Create Automatic Numbering Object dialog box.
DoubleBracketingBar[x, y, ...] displays as \[LeftDoubleBracketingBar]x, y, ...\[RightDoubleBracketingBar].
DoubleLeftArrow[x, y, ...] displays as x \[DoubleLeftArrow] y \[DoubleLeftArrow] ....
DoubleLeftRightArrow[x, y, ...] displays as x \[DoubleLeftRightArrow] y \[DoubleLeftRightArrow] ....
DoubleVerticalBar[x, y, ...] displays as x \[DoubleVerticalBar] y \[DoubleVerticalBar] ....
Equilibrium[x, y, ...] displays as x \[Equilibrium] y \[Equilibrium] ....
ExportAutoReplacements is an option for cells that specifies which replacement rules Mathematica automatically applies when exporting text.