PadLeft[list, n] makes a list of length n by padding list with zeros on the left. PadLeft[list, n, x] pads by repeating the element x. PadLeft[list, n, {x_1, x_2, ...}] pads ...

Placeholder[name] represents a placeholder labeled with name that indicates a place to type.Placeholder[] gives the empty placeholder \[Placeholder].

PrincipalValue is an option for Integrate that specifies whether the Cauchy principal value should be found for a definite integral.

expr >>> filename appends expr to a file. PutAppend[expr_1, expr_2, ..., " filename"] appends a sequence of expressions expr_i to a file.

ReverseGraph[g] gives the reverse graph of the directed g.

ScheduledTasks[] returns a list of ScheduledTaskObject expressions that represent current tasks.

SessionTime[] gives the total number of seconds of real time that have elapsed since the beginning of your Mathematica session.

Sharpen[image] gives a sharpened version of image.Sharpen[image, r] gives a version of image sharpened over pixel radius r.

Sound[primitives] represents a sound. Sound[primitives, t] specifies that the sound should have duration t.Sound[primitives, {t_min, t_max}] specifies that the sound should ...

StandardDeviationFilter[image, r] filters image by replacing every value by the standard deviations of the values in its range r neighborhood. StandardDeviationFilter[data, ...