NumberPoint is an option for NumberForm and related functions which gives the string to use as a decimal point.
Order
(Built-in Mathematica Symbol) Order[expr_1, expr_2] gives 1 if expr_1 is before expr_2 in canonical order, and -1 if expr_1 is after expr_2 in canonical order. It gives 0 if expr_1 is identical to expr_2.
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.
Plain
(Built-in Mathematica Symbol) Plain represents a font that is not bold, italic, or underlined.
ReturnTextPacket[string] is a MathLink packet containing string, the result of an EnterTextPacket evaluation.
SameTest is an option whose setting gives a pairwise comparison function to determine whether expressions should be considered the same.
ShowClosedCellArea is an option for cells that specifies whether a rectangular bar is displayed next to a closed cell group to indicate the number of cells in the group.
ShowPageBreaks is a notebook option that specifies whether to indicate in the on-screen display of a notebook where page breaks would occur if the notebook were printed.
StringCount["string", " sub"] gives a count of the number of times " sub" appears as a substring of " string". StringCount["string", patt] gives the number of substrings in " ...
StringToStream["string"] opens an input stream for reading from a string.