CellFrame is an option for Cell which specifies whether a frame should be drawn around a cell.
ComplexityFunction is an option for Simplify and other functions which gives a function to rank the complexity of different forms of an expression.
Dispatch[{lhs_1 -> rhs_1, lhs_2 -> rhs_2, ...}] generates an optimized dispatch table representation of a list of rules. The object produced by Dispatch can be used to give ...
ExponentialGeneratingFunction[expr, n, x] gives the exponential generating function in x for the sequence whose n\[Null]^th term is given by the expression ...
ExtendedGCD[n_1, n_2, ...] gives the extended greatest common divisor of the integers n_i.
FontProperties -> {opt_1 -> val_1, opt_2 -> val_2} specifies font properties.
Glaisher is Glaisher's constant with numerical value \[TildeEqual] 1.28243.
HoldFirst is an attribute which specifies that the first argument to a function is to be maintained in an unevaluated form.
HoldRest is an attribute which specifies that all but the first argument to a function are to be maintained in an unevaluated form.
ImageRegion is an option for cells that specifies the size and position of the bounding box within which a graphic is rendered.