LogicalExpand[expr] expands out logical combinations of equations, inequalities, and other functions.
MatchLocalNames is an option for Trace and related functions that specifies whether symbols such as x should match symbols with local names of the form x$nnn.
Modal
(Built-in Mathematica Symbol) Modal is an option to functions such as CreateDialog that specifies whether the dialog that is created should be modal to the Mathematica front end.
Modulus
(Built-in Mathematica Symbol) Modulus -> n is an option that can be given in certain algebraic functions to specify that integers should be treated modulo n.
MousePosition[] gives the current mouse position in the notebook front end. MousePosition["coords"] gives the mouse position with respect to the specified coordinate ...
NotebookObject[fe, id] is an object that represents an open notebook in the front end.
NullWords is an option for Read and related functions which specifies whether null words should be taken to exist between repeated word separators.
Numerator[expr] gives the numerator of expr.
Path
(Built-in Mathematica Symbol) Path is an option for Get and related functions which gives a list of directories to search in attempting to find an external file.
PolynomialRemainder[p, q, x] gives the remainder from dividing p by q, treated as polynomials in x.