Unicode: 22B3. Infix ordering operator. x ⊳ y is by default interpreted as RightTriangle[x,y]. Used in pure mathematics to mean 'contains as a normal subgroup'.

Unicode: F51F. Alias: Esc :> Esc. Infix operator with built-in evaluation rules. x  y is by default interpreted as x:>y or RuleDelayed[x,y]. x  y  z groups as x  (y  z).

Unicode: F522. Alias: Esc -> Esc. Infix operator with built-in evaluation rules. x  y is by default interpreted as x->y or Rule[x,y]. x  y  z groups as x  (y  z). ...

Unicode: 03E0. Aliases: Esc sa Esc, Esc sampi Esc. Special Greek letter. Appeared after ω in early Greek alphabet; used for Greek numeral 900.

Unicode: 266F. Letter-like form. Used to denote musical notes. Sometimes used in mathematical notation, typically to indicate some form of numbering or indexing. Not the same ...

Unicode: 03C3. Aliases: Esc s Esc, Esc sigma Esc. Greek letter. Used in TraditionalForm for DivisorSigma and WeierstrassSigma.

Unicode: 221A. Alias: Esc sqrt Esc. Prefix operator with built-in evaluation rules. √ x is by default interpreted as Sqrt[x]. Ctrl+@, Ctrl+2 or ∖@ yields a complete SqrtBox ...

Unicode: 228F. Infix set relation operator. x ⊏ y is by default interpreted as SquareSubset[x,y]. Used in computer science to indicate that x is a substring occurring at the ...

Unicode: 2290. Infix set relation operator. x ⊐ y is by default interpreted as SquareSuperset[x,y]. Used in computer science to indicate that x is a substring occurring at ...

Unicode: 22C6. Alias: Esc star Esc. Infix operator. x ⋆ y is by default interpreted as Star[x,y]. Used to denote convolution and generalized forms of multiplication. ...