AbelianGroup[{n_1, n_2, ...}] represents the direct product of the cyclic groups of degrees n_1, n_2, ....
AbortKernels[] aborts evaluations running in all parallel subkernels.
Abort
(Built-in Mathematica Symbol) Abort[] generates an interrupt to abort a computation.
AbsoluteThickness[d] is a graphics directive which specifies that lines which follow are to be drawn with absolute thickness d.
AdjustmentBox[box, opts] is a low-level box construct which displays with the placement of box adjusted using the options given.
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.
AlgebraicNumberPolynomial[a, x] gives the polynomial in x corresponding to the AlgebraicNumber object a.
AlgebraicNumberTrace[a] gives the trace of the algebraic number a.
Algebraics represents the domain of algebraic numbers, as in x \[Element] Algebraics.