Copy As opens a submenu to copy a selection and convert it to the specified format.
InsertResults is an option for NotebookEvaluate that determines whether to place the results of evaluation in the notebook being evaluated
ItemAspectRatio is an option for GraphicsGrid which specifies the ratio of height to width for the regions in which items are placed in the graphics grid.
PageBreakWithin is an option for Cell which specifies whether a page break should be allowed within the cell if the notebook that contains the cell is printed.
PowerModList[a, s/r, m] gives a list of all x modulo m for which x^r \[Congruent] a^s mod m.
TokenWords is an option for Read and related functions which gives a list of token words to be used to delimit words.
Heads
(Built-in Mathematica Symbol) Heads is an option for functions which use level specifications that specifies whether heads of expressions should be included.
mathlink.h MathLink header file.
Star
(Combinatorica Package Symbol) Star[n] constructs a star on n vertices, which is a tree with one vertex of degree n - 1.
Unicode: 228E. Infix operator. x ⊎ y is by default interpreted as UnionPlus[x,y]. Used to denote union of multisets, in which multiplicities of elements are added.