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Dots of graded size standing for brightness.
Also known as: Chart star sizes, Magnitude dots
On a star chart the size of a dot stands for brightness, not for the star's actual size. Every star is a point at any magnification, so dot size is the only way a printed chart can convey magnitude at all.
Represent stellar brightness by dot size on a printed chart, larger dots marking brighter stars.
Contexts: Technical drawing, Maps
Do not represent physical size, since every star is a point source at any magnification a chart could correspond to.
Contexts: Technical drawing, Maps
Filled circles of several graded diameters scattered on a dark or pale ground, the largest few in number.