ImageRegion is an option for cells that specifies the size and position of the bounding box within which a graphic is rendered.

Mathematica represents matrices and vectors using lists. Anything that is not a list Mathematica considers as a scalar. A vector in Mathematica consists of a list of scalars. ...

COperator[oper, arg_1, ...] is a symbolic representation of an operator.

GridBox[{{box_11, box_12, ...}, {box_21, box_22, ...}, ...}] is a low-level box construct that represents a two-dimensional grid of boxes or strings in notebook expressions.

Interval[{min, max}] represents the range of values between min and max. Interval[{min_1 , max_1}, {min_2 , max_2}, ...] represents the union of the ranges min_1 to max_1, ...

MachinePrecision is a symbol used to indicate machine-number precision.

ManhattanDistance[u, v] gives the Manhattan or "city block" distance between vectors u and v.

MatrixQ[expr] gives True if expr is a list of lists or a two-dimensional SparseArray object that can represent a matrix, and gives False otherwise. MatrixQ[expr, test] gives ...

Message[symbol::tag] prints the message symbol::tag unless it has been switched off. Message[symbol::tag, e_1, e_2, ...] prints a message, inserting the values of the e_i as ...

SplineWeights is an option for B-spline functions and graphics primitives that specifies weights of control points.