BeginPackage["context`"] makes context` and System` the only active contexts. BeginPackage["context`", {"need_1`", "need_2`", ...}] calls Needs on the need_i.
BitXor
(Built-in Mathematica Symbol) BitXor[n_1, n_2, ...] gives the bitwise XOR of the integers n_i.
Column
(Built-in Mathematica Symbol) Column[{expr_1, expr_2, ...}] is an object that formats with the expr_i arranged in a column, with expr_1 above expr_2, etc. Column[list, alignment] aligns each element ...
CreatePalette[expr] creates a palette notebook containing expr, and opens it in the front end.CreatePalette[{expr_1, expr_2, ...}] creates and opens a palette notebook ...
DigitCount[n, b, d] gives the number of d digits in the base-b representation of n. DigitCount[n, b] gives a list of the numbers of 1, 2, ..., b - 1, 0 digits in the base-b ...
Frame
(Built-in Mathematica Symbol) Frame is an option for Graphics, Grid, and other constructs that specifies whether to include a frame.
GraphicsGrid[{{g_11, g_12, ...}, ...}] generates a graphic in which the g_ij are laid out in a two-dimensional grid.
JacobiSymbol[n, m] gives the Jacobi symbol (n/m).
MoebiusMu[n] gives the Möbius function \[Mu](n).
MovingMedian[list, r] gives the moving median of list, computed using spans of r elements.