Unicode: 21C4. Infix arrow operator. x ⇄ y is by default interpreted as RightArrowLeftArrow[x,y]. Extensible character.
Unicode: 2309. Alias: Esc rc Esc. Matchfix operator with built-in evaluation rules. ⌈ x ⌉ is by default interpreted as Ceiling[x]. Extensible character.
Unicode: 301B. Alias: Esc ]] Esc. m 〚i,j,… 〛 is by default interpreted as Part[m,i,j,…]. Extensible character; grows by default to limited size.
Unicode: 295D. Infix arrow-like operator. x ⥝ y is by default interpreted as RightDownTeeVector[x,y]. Extensible character.
Unicode: 2955. Infix arrow-like operator. x ⥕ y is by default interpreted as RightDownVectorBar[x,y]. Extensible character.
Unicode: 21C2. Infix arrow-like operator. x ⇂ y is by default interpreted as RightDownVector[x,y]. Extensible character.
Unicode: 230B. Alias: Esc rf Esc. Matchfix operator with built-in evaluation rules. ⌊ x ⌋ is by default interpreted as Floor[x]. Extensible character.
Unicode: 295B. Infix arrow-like operator. x ⥛ y is by default interpreted as RightTeeVector[x,y]. Extensible character.
Unicode: 29D0. Infix ordering operator. x ⧐ y is by default interpreted as RightTriangleBar[x,y].
Unicode: 22B5. Infix ordering operator. x ⊵ y is by default interpreted as RightTriangleEqual[x,y].