FractionBox[x, y] is a low-level formatting construct that represents x/y in notebook expressions.
FractionBoxOptions -> {opt_1 -> val_1, opt_2 -> val_2, ...} is an option for cells that specifies settings for FractionBox objects within the cell.
FractionLine is an option for fractions that specifies the thickness of the line separating the numerator and denominator.
FrameBox[box] is a low-level box construct which represents box with a frame drawn around it.
FrameBoxOptions -> {opt_1 -> val_1, opt_2 -> val_2, ...} is an option for cells that specifies default settings.
Framed
(Built-in Mathematica Symbol) Framed[expr] displays a framed version of expr.
FrameLabel is an option for Graphics, Manipulate, and related functions that specifies labels to be placed on the edges of a frame.
FrameMargins is an option for objects that can be displayed with frames which specifies the absolute margins in printer's points to leave inside the frame.
Frame
(Built-in Mathematica Symbol) Frame is an option for Graphics, Grid, and other constructs that specifies whether to include a frame.
FrameStyle is an option for Graphics, Grid, and other constructs that specifies the style in which to draw frames.