NameQ (Built-in Mathematica Symbol)

NameQ["string"] yields True if there are any symbols whose names match the string pattern given, and yields False otherwise.

NumberString (Built-in Mathematica Symbol)

NumberString represents the characters of a number in StringExpression.

OutputStream (Built-in Mathematica Symbol)

OutputStream["name", n] is an object that represents an output stream for functions such as Write.

Pause (Built-in Mathematica Symbol)

Pause[n] pauses for at least n seconds.

Plus (Built-in Mathematica Symbol)

x + y + z represents a sum of terms.

PodWidth (Built-in Mathematica Symbol)

PodWidth is an option for WolframAlpha that determines the width parameters of the content returned by the Wolfram|Alpha API.

PowerModList (Built-in Mathematica Symbol)

PowerModList[a, s/r, m] gives a list of all x modulo m for which x^r \[Congruent] a^s mod m.

ReleaseHold (Built-in Mathematica Symbol)

ReleaseHold[expr] removes Hold, HoldForm, HoldPattern, and HoldComplete in expr.

ReturnExpressionPacket (Built-in Mathematica Symbol)

ReturnExpressionPacket[expr] is a MathLink packet that contains the expression expr, the result of an EnterExpressionPacket evaluation.

RowMinHeight (Built-in Mathematica Symbol)

RowMinHeight is an option for the low-level function GridBox that specifies the minimum total height in units of font size that should be allowed for each row.