\[ContourIntegral] (Mathematica Character Name)

Unicode: 222E. Alias: Esc cint Esc. Compound operator. ∮ f x is by default interpreted as ContourIntegral[f,x].

\[Cup] (Mathematica Character Name)

Unicode: 2323. Infix operator. x ⌣ y is by default interpreted as Cup[x,y]. Used in pure mathematics to mean cup product.

\[CurlyCapitalUpsilon] (Mathematica Character Name)

Unicode: 03D2. Aliases: Esc cU Esc, Esc cUpsilon Esc. Greek letter. Not commonly used. Used in astronomy for mass to light ratio.

\[CurlyKappa] (Mathematica Character Name)

Unicode: 03F0. Aliases: Esc ck Esc, Esc ckappa Esc. Greek letter.

\[CurlyPi] (Mathematica Character Name)

Unicode: 03D6. Aliases: Esc cp Esc, Esc cpi Esc. Greek letter. Not commonly used, except in astronomy.

\[CurlyRho] (Mathematica Character Name)

Unicode: 03F1. Aliases: Esc cr Esc, Esc crho Esc. Greek letter.

\[Dash] (Mathematica Character Name)

Unicode: 2013. Alias: Esc - Esc. Letter-like form.

\[Delta] (Mathematica Character Name)

Unicode: 03B4. Aliases: Esc d Esc, Esc delta Esc. Greek letter.

\[Diameter] (Mathematica Character Name)

Unicode: 2300. Letter-like form. Used in geometry. Not the same as \[CapitalOSlash] or \[EmptySet].

\[Diamond] (Mathematica Character Name)

Unicode: 22C4. Alias: Esc dia Esc. Infix operator. x ⋄ y is by default interpreted as Diamond[x,y].