GeometricTransformation[g, tfun] represents the result of applying the transformation function tfun to the geometric objects corresponding to the primitives ...
GridCreationSettings -> {opt_1 -> val_1, opt_2 -> val_2, ...} is a global option that specifies settings for the Create Table/Matrix dialog.
HilbertMatrix[n] gives the n*n Hilbert matrix with elements of the form 1/(i + j - 1).HilbertMatrix[{m, n}] gives the m*n Hilbert matrix.
Hyphenation is an option for Cell that specifies whether to allow hyphenation for words of text.
InputStream["name", n] is an object that represents an input stream for functions such as Read and Find.
Interrupt[] generates an interrupt.
IntervalMemberQ[interval, x] gives True if the number x lies within the specified interval, and False otherwise. IntervalMemberQ[interval_1, interval_2] gives True if ...
Inverse
(Built-in Mathematica Symbol) Inverse[m] gives the inverse of a square matrix m.
LetterCharacter represents a letter character in StringExpression.
Monitor
(Built-in Mathematica Symbol) Monitor[expr, mon] generates a temporary monitor cell in which the continually updated current value of mon is displayed during the course of evaluation of expr.