AnimationRepetitions is an option to Animate and related functions that specifies how many times the animation they create runs before stopping.

AppendTo[s, elem] appends elem to the value of s, and resets s to the result.

ArcSinh[z] gives the inverse hyperbolic sine sinh -1 (z) of the complex number z.

AutoDelete is an option for boxes that specifies whether a box is automatically deleted when its contents are edited.

AutoItalicWords is an option for Cell that gives a list of words that should automatically be put in italics when they are entered.

BaseForm[expr, n] prints with the numbers in expr given in base n.

BitLength[n] gives the number of binary bits necessary to represent the integer n.

Boole[expr] yields 1 if expr is True and 0 if it is False.

CellEpilog is an option for Cell which gives an expression to evaluate after each ordinary evaluation of the contents of the cell.

CellOpen is an option for Cell that specifies whether the contents of a cell should be explicitly displayed.