Protected is an attribute which prevents any values associated with a symbol from being modified.
RandomPrime[{i_min, i_max}] gives a pseudorandom prime number in the range i_min to i_max.RandomPrime[i_max] gives a pseudorandom prime number in the range 2 to ...
Rescale
(Built-in Mathematica Symbol) Rescale[x, {min, max}] gives x rescaled to run from 0 to 1 over the range min to max. Rescale[x, {min, max}, {x_min, x_max}] gives x rescaled to run from x_min to x_max over ...
ScheduledTaskObject[id, expr, spec, ...] is a task object specifying future evaluation of expr according to spec.
SquareFreeQ[expr] gives True if expr is a square-free polynomial or number, and False otherwise.SquareFreeQ[expr, vars] gives True if expr is square free with respect to the ...
SynchronousUpdating is an option for Manipulate, Dynamic, and related functions that specifies whether or not to evaluate their contents synchronously.
TrackedSymbols is an option to Refresh, Manipulate, and related functions that specifies which symbols should trigger updates when their values are changed.
Trig
(Built-in Mathematica Symbol) Trig is an option for various polynomial manipulation functions that specifies whether trigonometric functions should be treated like polynomial elements.
$TimedOut is a special symbol returned by certain functions when an operation times out.
$TimeZone gives the current time zone to assume for dates and times.