\[RightDoubleBracket] (Mathematica Character Name)

Unicode: 301B. Alias: Esc ]] Esc. m 〚i,j,… 〛 is by default interpreted as Part[m,i,j,…]. Extensible character; grows by default to limited size.

\[RoundSpaceIndicator] (Mathematica Character Name)

Unicode: F3B2. Spacing character. Interpreted by default as equivalent to \[RawSpace].

\[SpaceIndicator] (Mathematica Character Name)

Unicode: 2423. Alias: Esc space Esc. Spacing character. Interpreted by default as equivalent to \[RawSpace].

\[SphericalAngle] (Mathematica Character Name)

Unicode: 2222. Letter-like form. Used in geometry to indicate a spherical angle, as in the symbol ∢ ABC.

\[SquareUnion] (Mathematica Character Name)

Unicode: 2294. Infix operator. x ⊔ y is by default interpreted as SquareUnion[x,y]. Used in mathematics to denote various forms of generalized union, typically of disjoint ...

\[TildeFullEqual] (Mathematica Character Name)

Unicode: 2245. Alias: Esc ~== Esc. Infix similarity operator. x ≅ y is by default interpreted as TildeFullEqual[x,y]. Used in mathematics to indicate isomorphism, congruence ...

\[UnionPlus] (Mathematica Character Name)

Unicode: 228E. Infix operator. x ⊎ y is by default interpreted as UnionPlus[x,y]. Used to denote union of multisets, in which multiplicities of elements are added.

\[UpperLeftArrow] (Mathematica Character Name)

Unicode: 2196. Infix arrow operator. x ↖ y is by default interpreted as UpperLeftArrow[x,y]. Extensible character; grows by default to limited size.

\[UpperRightArrow] (Mathematica Character Name)

Unicode: 2197. Infix arrow operator. x ↗ y is by default interpreted as UpperRightArrow[x,y]. Extensible character; grows by default to limited size.

\[VerticalEllipsis] (Mathematica Character Name)

Unicode: 22EE. Letter-like form. Used to indicate omitted elements in columns of a matrix.