\[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.

\[UpArrowBar] (Mathematica Character Name)

Unicode: 2912. Infix arrow operator. x ⤒ y is by default interpreted as UpArrowBar[x,y]. Extensible character.

\[UpArrowDownArrow] (Mathematica Character Name)

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

\[UpDownArrow] (Mathematica Character Name)

Unicode: 2195. Infix arrow operator. x ↕ y is by default interpreted as UpDownArrow[x,y]. Extensible character.

\[UpEquilibrium] (Mathematica Character Name)

Unicode: 296E. Infix arrow-like operator. x ⥮ y is by default interpreted as UpEquilibrium[x,y]. Extensible character.

\[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.

\[Upsilon] (Mathematica Character Name)

Unicode: 03C5. Aliases: Esc u Esc, Esc upsilon Esc. Greek letter.