Record
(Built-in Mathematica Symbol) Record represents a record in Read, Find, and related functions.
$Output
(Built-in Mathematica Symbol) $Output gives the list of files and pipes to which standard output from Mathematica is sent.
MemberQ
(Built-in Mathematica Symbol) MemberQ[list, form] returns True if an element of list matches form, and False otherwise. MemberQ[list, form, levelspec] tests all parts of list specified by levelspec.
Count
(Built-in Mathematica Symbol) Count[list, pattern] gives the number of elements in list that match pattern. Count[expr, pattern, levelspec] gives the total number of subexpressions matching pattern that ...
CharacterEncoding is an option for input and output functions which specifies what raw character encoding should be used.
FrontEndEventActions is an option for the notebook front end that gives a list of actions to perform when specified user-interface events occur.
SubscriptBox[x, y] is the low-level box representation for x_y in notebook expressions.
SuperscriptBox[x, y] is the low-level box representation for x^y in notebook expressions.
UnderoverscriptBox[x, y, z] is the low-level box representation for x_y^z in notebook expressions.
GridBox
(Built-in Mathematica Symbol) GridBox[{{box_11, box_12, ...}, {box_21, box_22, ...}, ...}] is a low-level box construct that represents a two-dimensional grid of boxes or strings in notebook expressions.