Stub
(Built-in Mathematica Symbol) Stub is an attribute which specifies that if a symbol is ever used, Needs should automatically be called on the context of the symbol.
FileDate["file"] gives the date and time at which a file was last modified. FileDate["file", " type"] gives information on the specified type of date associated with a file.
Locked
(Built-in Mathematica Symbol) Locked is an attribute that, once assigned, prevents modification of any attributes of a symbol.
SequenceHold is an attribute that specifies that Sequence objects appearing in the arguments of a function should not automatically be flattened out.
HoldRest is an attribute which specifies that all but the first argument to a function are to be maintained in an unevaluated form.
HoldFirst is an attribute which specifies that the first argument to a function is to be maintained in an unevaluated form.
Temporary is an attribute assigned to symbols which are created as local variables by Module.
ReadProtected is an attribute that prevents values associated with a symbol from being seen.
Orderless is an attribute that can be assigned to a symbol f to indicate that the elements e_i in expressions of the form f[e_1, e_2, ...] should automatically be sorted into ...
Protected is an attribute which prevents any values associated with a symbol from being modified.