Names
(Built-in Mathematica Symbol) Names["string"] gives a list of the names of symbols which match the string. Names[patt] gives a list of names matching the arbitrary string pattern patt.
NextPrime[n] gives the next prime above n.NextPrime[n, k] gives the k\[Null]^th prime above n.
Notebook[{cell_1, cell_2, ...}] is the low-level construct that represents a notebook manipulated by the Mathematica front end.
OpenRead["file"] opens a file to read data from, and returns an InputStream object.
PageWidth is an option for output streams and for cells which specifies how wide each line of text should be allowed to be.
RotateLeft[expr, n] cycles the elements in expr n positions to the left. RotateLeft[expr] cycles one position to the left. RotateLeft[expr, {n_1, n_2, ...}] cycles elements ...
Shallow
(Built-in Mathematica Symbol) Shallow[expr] prints as a shallow form of expr. Shallow[expr, depth] prints with all parts of expr below the specified depth given in skeleton form. Shallow[expr, {depth, ...
StringLength["string"] gives the number of characters in a string.
StringReverse["string"] reverses the order of the characters in " string".
SystemInformation[] gives detailed information about the Mathematica system being run. SystemInformation["comp"] gives a list of rules with information about the component " ...