\[SucceedsSlantEqual] (Mathematica Character Name)

Unicode: 227D. Infix ordering operator. x ≽ y is by default interpreted as SucceedsSlantEqual[x,y].

\[SucceedsTilde] (Mathematica Character Name)

Unicode: 227F. Infix ordering operator. x ≿ y is by default interpreted as SucceedsTilde[x,y].

\[SupersetEqual] (Mathematica Character Name)

Unicode: 2287. Alias: Esc sup= Esc. Infix set relation operator. x ⊇ y is by default interpreted as SupersetEqual[x,y].

\[Tau] (Mathematica Character Name)

Unicode: 03C4. Aliases: Esc t Esc, Esc tau Esc. Greek letter.

\[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 ...

\[UnderBrace] (Mathematica Character Name)

Unicode: FE38. Alias: Esc u{ Esc. Letter-like form. Extensible character.

\[UnderBracket] (Mathematica Character Name)

Unicode: 23B5. Alias: Esc u[ Esc. Letter-like form. Extensible character.

\[UnderParenthesis] (Mathematica Character Name)

Unicode: FE36. Alias: Esc u( Esc. Letter-like form. Extensible character.

\[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.

\[UpArrowDownArrow] (Mathematica Character Name)

Unicode: 21C5. Infix arrow operator. x ⇅ y is by default interpreted as UpArrowDownArrow[x,y]. Extensible character.