Unicode: 2226. Alias: Esc !|| Esc. Infix operator. x ∦ y is by default interpreted as NotDoubleVerticalBar[x,y]. Used in geometry to mean "not parallel to".

Unicode: 2237. Infix relational operator. x ∷ y is by default interpreted as Proportion[x,y]. Used historically to indicate equality; now used to indicate proportion.

Unicode: 005C. Raw operator. Equivalent to the ordinary ASCII character with code 92. Equivalent in strings to ∖∖.

Unicode: 002E. Raw operator. Equivalent to the ordinary ASCII character with code 46. As an overscript, used to indicate time derivative. OverscriptBox[x, .] is interpreted ...

Unicode: 0022. Raw operator. Equivalent to the ordinary ASCII character with code 34. Equivalent to ∖" in strings.

Unicode: 002F. Raw operator. Equivalent to the ordinary ASCII character with code 47. Extensible character; grows by default to limited size.

Unicode: 007E. Raw operator. Equivalent to the ordinary ASCII character with code 126. In addition to one-dimensional uses, OverscriptBox[x, ~] is by default interpreted as ...

Unicode: 21E5. Infix arrow operator. x ⇥ y is by default interpreted as RightArrowBar[x,y]. Used in mathematics to indicate an epimorphism. Sometimes used to indicate a tab. ...

Unicode: 21BE. Infix arrow-like operator. x ↾ y is by default interpreted as RightUpVector[x,y]. Used in pure mathematics to indicate the restriction of x to y. Extensible ...

Unicode: 22A5. Alias: Esc uT Esc. Infix relational operator. x ⊥ y is by default interpreted as UpTee[x,y]. Used in geometry to indicate perpendicular. Used in number theory ...