PageHeaderLines is an option for notebooks that specifies whether a horizontal line is inserted at the top of each page when the notebook is printed.

PolynomialQuotientRemainder[p, q, x] gives a list of the quotient and remainder of p and q, treated as polynomials in x.

Positive[x] gives True if x is a positive number.

PowerMod[a, b, m] gives a^b mod m. PowerMod[a, -1, m] finds the modular inverse of a modulo m.PowerMod[a, 1/r, m] finds a modular r\[Null]^th root of a.

PrimeQ[expr] yields True if expr is a prime number, and yields False otherwise.

Rational is the head used for rational numbers.

RawData[data] is a low-level representation of the contents of a cell in which Show Cell Expression has been toggled.

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

RunScheduledTask[expr] schedules and starts a task that will repeatedly evaluate expr once per second.RunScheduledTask[expr, time] schedules and starts a task that will ...

SampleRate is an option for sound primitives that specifies the number of samples per second to generate for sounds.