ExponentFunction is an option for NumberForm and related functions that determines the exponent to use in printing approximate real numbers.
FieldSize is an option for InputField, PopupMenu, and related functions that specifies the size of the field allowed for input or contents.
FourierCoefficient[expr, t, n] gives the n\[Null]^th coefficient in the Fourier series expansion of expr.FourierCoefficient[expr, {t_1, t_2, ...}, {n_1, n_2, ...}] gives a ...
FrameTicksStyle is an option for 2D graphics functions that specifies how frame ticks should be rendered.
General
(Built-in Mathematica Symbol) General is a symbol to which general system messages are attached.
GraphCenter[g] gives the set of vertices with minimum eccentricity in the graph g.
GraphDistance[g, s, t] gives the distance from source vertex s to target vertex t in the graph g.GraphDistance[g, s] gives the distance from s to all vertices of the graph g.
HankelH1[n, z] gives the Hankel function of the first kind H_n^(1)(z).
HankelH2[n, z] gives the Hankel function of the second kind H_n^(2)(z).
IdentityMatrix[n] gives the n*n identity matrix.