\[OE] (Mathematica Character Name)

Unicode: 0153 Alias: Esc oe Esc. Letter.

\[OGrave] (Mathematica Character Name)

Unicode: 00F2. Alias: Esc o` Esc. Letter. Included in ISO Latin-1.

\[Omega] (Mathematica Character Name)

Unicode: 03C9. Aliases: Esc o Esc, Esc omega Esc, Esc w Esc. Greek letter.

\[Omicron] (Mathematica Character Name)

Unicode: 03BF. Aliases: Esc om Esc, Esc omicron Esc. Greek letter. Not the same as English o.

\[Or] (Mathematica Character Name)

Unicode: 2228. Aliases: Esc || Esc, Esc or Esc. Infix operator with built-in evaluation rules. x ∨ y is by default interpreted as Or[x,y], equivalent to x||y. Not the same as ...

\[OSlash] (Mathematica Character Name)

Unicode: 00F8. Alias: Esc o/ Esc. Letter. Included in ISO Latin-1. Not the same as \[EmptySet].

\[OverBrace] (Mathematica Character Name)

Unicode: FE37. Alias: Esc o{ Esc. Letter-like form. Extensible character.

\[OverBracket] (Mathematica Character Name)

Unicode: 23B4. Alias: Esc o[ Esc. Letter-like form. Extensible character.

\[OverParenthesis] (Mathematica Character Name)

Unicode: FE35. Alias: Esc o( Esc. Letter-like form. Extensible character.

\[Phi] (Mathematica Character Name)

Unicode: 03D5. Aliases: Esc ph Esc, Esc phi Esc, Esc f Esc. Greek letter. Used in TraditionalForm for EulerPhi and GoldenRatio.