Unicode: F52B. x y is by default interpreted as ShortDownArrow[x,y]. Infix arrow operator.
Unicode: F52A. x y is by default interpreted as ShortUpArrow[x,y]. Infix arrow operator.
Direction is an option for Limit that specifies the direction in which the limit is taken.
NumberPadding is an option for NumberForm and related functions which gives strings to use as padding on the left- and right-hand sides of numbers.
Unicode: 222B. Alias: Esc int Esc. Compound operator with built-in evaluation rules. ∫ f x is by default interpreted as Integrate[f,x]. ∫_a^b f x is by default ...
FormatTypeAutoConvert is an option for cells that specifies whether the contents of a cell are automatically converted into a different format when the style of that cell is ...
FractionLine is an option for fractions that specifies the thickness of the line separating the numerator and denominator.
MatchLocalNames is an option for Trace and related functions that specifies whether symbols such as x should match symbols with local names of the form x$nnn.
$DisplayFunction gives the default setting for the option DisplayFunction in graphics functions.