Unicode: 230B. Alias: Esc rf Esc. Matchfix operator with built-in evaluation rules. ⌊ x ⌋ is by default interpreted as Floor[x]. Extensible character.
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: F3C7. Alias: Esc tr Esc. Superscript postfix operator with built-in evaluation rules. m^ is by default interpreted as Transpose[m]. Not the same as keyboard T.
\[Xnor]
(Mathematica Character Name) Unicode: F4A2 Alias: Esc xnor Esc. Infix operator with built-in evaluation rules. x y is by default interpreted as Xnor[x,y].
\[Xor]
(Mathematica Character Name) Unicode: 22BB. Alias: Esc xor Esc. Infix operator with built-in evaluation rules. x ⊻ y is by default interpreted as Xor[x,y].
Abort
(Built-in Mathematica Symbol) Abort[] generates an interrupt to abort a computation.
AiryAiZero[k] represents the k\[Null]^th zero of the Airy function Ai(x).AiryAiZero[k, x_0] represents the k\[Null]^th zero less than x_0.
AiryBiZero[k] represents the k\[Null]^th zero of the Airy function Bi(x).AiryBiZero[k, x_0] represents the k\[Null]^th zero less than x_0.
BesselYZero[n, k] represents the k\[Null]^th zero of the Bessel function of the second kind Y_n (x).BesselYZero[n, k, x_0] represents the k\[Null]^th zero greater than x_0.
ButtonBox[boxes] is a low-level box construct that represents a button in a notebook expression.