\[Thorn] (Mathematica Character Name)

Unicode: 00FE. Alias: Esc thn Esc. Letter. Included in ISO Latin-1. Used in Icelandic and Old English.

\[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 ...

\[UDoubleAcute] (Mathematica Character Name)

Unicode: 0171. Alias: Esc u'' Esc. Letter. Included in ISO Latin-2. Used in Hungarian.

\[UDoubleDot] (Mathematica Character Name)

Unicode: 00FC. Alias: Esc u" Esc. Letter. Included in ISO Latin-1.

\[UGrave] (Mathematica Character Name)

Unicode: 00F9. Alias: Esc u` Esc. Letter. Included in ISO Latin-1.

\[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.