The assortment of special characters, that has been made a part of most PostScript typefaces, is called a pi set. This assortment of characters, includes accents, mathematical symbols, and foreign currency symbols. Lower case and accented lower case letters. Figures, punctuation and reference marks Ligatures and pi characters. The lines that make up a letter are called strokes.
Some strokes lean.
Serifs Some strokes are finished with serifs. Curves Rounded letters have a point of axis on the curved elements. Size Each typeform is designed with a consistent and relevant size. This size, measured in points is called the x-height. Or read what others have already said.