\[PrecedesTilde] (Mathematica Character Name)

Unicode: 227E. Infix ordering operator. x ≾ y is by default interpreted as PrecedesTilde[x,y].

\[Proportion] (Mathematica Character Name)

Unicode: 2237. Infix relational operator. x ∷ y is by default interpreted as Proportion[x,y]. Used historically to indicate equality; now used to indicate proportion.

\[Psi] (Mathematica Character Name)

Unicode: 03C8. Aliases: Esc ps Esc, Esc psi Esc, Esc y Esc. Greek letter. Used in TraditionalForm for PolyGamma.

\[ReverseDoublePrime] (Mathematica Character Name)

Unicode: 2036. Alias: Esc `` Esc. Letter-like form.

\[ReverseEquilibrium] (Mathematica Character Name)

Unicode: 21CB. Infix arrow-like operator. x ⇋ y is by default interpreted as ReverseEquilibrium[x,y]. Extensible character.

\[ReversePrime] (Mathematica Character Name)

Unicode: 2035. Alias: Esc ` Esc. Letter-like form. Used in an overscript position as a grave accent.

\[ReverseUpEquilibrium] (Mathematica Character Name)

Unicode: 296F. Infix arrow-like operator. x ⥯ y is by default interpreted as ReverseUpEquilibrium[x,y]. Extensible character.

\[Rho] (Mathematica Character Name)

Unicode: 03C1. Aliases: Esc r Esc, Esc rho Esc. Greek letter.

\[RightAngle] (Mathematica Character Name)

Unicode: 221F. Letter-like form. Used in geometry to indicate a right angle, as in the symbol ∟ ABC.

\[RightArrowBar] (Mathematica Character Name)

Unicode: 21E5. Infix arrow operator. x ⇥ y is by default interpreted as RightArrowBar[x,y]. Used in mathematics to indicate an epimorphism. Sometimes used to indicate a tab. ...