\[Iota] (Mathematica Character Name)

Unicode: 03B9. Aliases: Esc i Esc, Esc iota Esc. Greek letter. Not commonly used. Used in set theory to indicate an explicitly constructible set.

\[LeftArrowBar] (Mathematica Character Name)

Unicode: 21E4. Infix arrow operator. x ⇤ y is by default interpreted as LeftArrowBar[x,y]. Sometimes used to indicate a backtab. Extensible character.

\[LowerLeftArrow] (Mathematica Character Name)

Unicode: 2199. Infix arrow operator. x ↙ y is by default interpreted as LowerLeftArrow[x,y]. Extensible character; grows by default to limited size.

\[LowerRightArrow] (Mathematica Character Name)

Unicode: 2198. Infix arrow operator. x ↘ y is by default interpreted as LowerRightArrow[x,y]. Extensible character; grows by default to limited size.

\[MeasuredAngle] (Mathematica Character Name)

Unicode: 2221. Letter-like form. Used in geometry to indicate an angle, as in the symbol ∡ ABC.

\[NotGreater] (Mathematica Character Name)

Unicode: 226F. Alias: Esc !> Esc. Infix ordering operator. x ≯ y is by default interpreted as NotGreater[x,y]. ≯ is equivalent to ≤ only for a totally ordered set.

\[NotLess] (Mathematica Character Name)

Unicode: 226E. Alias: Esc !< Esc. Infix ordering operator. x ≮ y is by default interpreted as NotLess[x,y]. ≮ is equivalent to ≥ only for a totally ordered set.

\[NotVerticalBar] (Mathematica Character Name)

Unicode: 2224. Alias: Esc !| Esc. Infix operator. x  y is by default interpreted as NotVerticalBar[x,y]. Used in mathematics to mean x does not divide y.

\[Null] (Mathematica Character Name)

Unicode: F3A0. Alias: Esc null Esc. Letter-like form. Can be used to place subscripts and superscripts without having a visible base.

\[RawAt] (Mathematica Character Name)

Unicode: 0040. Raw operator. Equivalent to the ordinary ASCII character with code 64.