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Special Characters
Mathematica not only has systemwide support for arbitrary Unicode characters, but also includes nearly a thousand carefully designed characters for mathematical notation and technical presentation—all fully integrated into Mathematica's input, output, and graphics.
Reference
EscnnnEsc or \[Name] — named character (e.g. 
, EscaEsc, \[Alpha])
Insert ► Special Character — palette of all named special characters
Mathematica Syntax »
∞ ▪ ° ▪ 
▪ × ▪ 
▪ 
▪ 
▪ 
▪ 
▪ 
▪ 
▪ → ▪ ⧴ ▪ 
▪ 
▪ ...
\[Degree] ▪ \[ImaginaryI] ▪ \[Times] ▪ \[Element] ▪ \[Rule] ▪ ...
Greek Letters »
▪ 
▪ 
▪ 
▪ 
▪ 
▪ 
▪ 
▪ 
▪ 
▪ ...
\[Alpha] ▪ \[CurlyTheta] ▪ \[CapitalDelta] ▪ \[Sampi] ▪ ...
Notational Alphabets »
▪ 
▪ 
▪ 
▪ 
▪ 
▪ 
▪ 
▪ 
▪ ...
\[ScriptA] ▪ \[ScriptCapitalA] ▪ \[GothicA] ▪ \[FormalA] ▪ \[Aleph] ▪ ...
Mathematical Notation »
▪ 
▪ ▪ 
▪ 
▪ 
▪ 
▪ 
▪ 
▪ ▪ 
▪ 
▪ 
▪ ...
\[Integral] ▪ \[Sum] ▪ \[Del] ▪ \[ForAll] ▪ \[CirclePlus] ▪ ...
Arrows & Arrow-Like Forms »
▪ 
▪ 
▪ 
▪ 
▪ 
▪ 
▪ 
▪ 
▪ 
▪ 
▪ ...
\[RightArrow] ▪ \[LongRightArrow] ▪ \[DoubleRightArrow] ▪ \[LeftRightArrow] ▪ ...
Textual Forms »
- ▪ — ▪ 
▪ 
▪ ¶ ▪ † ▪ ✓ ▪ " ▪ " ▪ ¿ ▪ © ▪ ...
\[Dash] ▪ \[LongDash] ▪ \[Bullet] ▪ \[Copyright] ▪ ...
Currency, Units, and Special Notations »
▪ £ ▪ µ ▪ 
▪ 
▪ ♂ ▪ ♃ ▪ ♪ ▪ 
▪ 
▪ \[WhiteKnight] ▪ ...
\[Euro] ▪ \[Sterling] ▪ \[Micro] ▪ \[Mars] ▪ \[Natural] ▪ ...
User Interfaces & Documentation »
Shapes, Icons, etc. »
▪ 
▪ 
▪ 
▪ 
▪ 
▪ 
▪ 
▪ ...
\[FilledSquare] ▪ \[EmptySquare] ▪ \[HappySmiley] ▪ ...
Non-Printing Characters »
\[ThinSpace] ▪ \[NonBreakingSpace] ▪ \[InvisibleComma] ▪ \[AlignmentMarker] ▪ ...
International Characters »
é ▪ ö ▪ à ▪ á ▪ â ▪ ã ▪ ä ▪ å ▪ ç ▪ 
▪ ø ▪ æ ▪ ß ▪ ...
\[EAcute] ▪ \[ODoubleDot] ▪ \[CHacek] ▪ ...
ToCharacterCode ▪ FromCharacterCode ▪ CharacterRange
FullForm — show characters in their full named form
\nn, \:nnnn — enter octal or Unicode forms
Esc\alphaEsc, EscΑEsc, etc. — enter 
, HTML, SGML, etc. forms
