Gsharp4 gives the frequency of the note G-sharp in octave 4.
Gsharp5 gives the frequency of the note G-sharp in octave 5.
Gsharp6 gives the frequency of the note G-sharp in octave 6.
Gsharp7 gives the frequency of the note G-sharp in octave 7.
There are a variety of ways to describe probability distributions such as probability density or mass, cumulative versions of density and mass, inverses of the cumulative ...
AbsolutePointSize[d] is a graphics directive which specifies that points which follow are to be shown if possible as circular regions with absolute diameter d.
FontProperties -> {opt_1 -> val_1, opt_2 -> val_2} specifies font properties.
GeoPositionENU[{east, north, up}, p] represents a point with local Cartesian coordinates {east, north, up} in a reference system specified by the position p.
HelpBrowserSettings -> {opt_1 -> val_1, opt_2 -> val_2, ...} is a global option that specifies settings for the legacy Help Browser.
Norm
(Built-in Mathematica Symbol) Norm[expr] gives the norm of a number, vector or matrix. Norm[expr, p] gives the p-norm.