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Also called lowercase figures, or oldstyle figures, these number forms are designed to be used in running text. Text figures feature numerals that come to the x-height: 0,1,2; figures with descenders: 3,4,5,7,9; and ascending figures: 6, 8. Some varations of text figures may not fit this same scheme, but this is the norm.
See also Lining Figures.
FYTI: Oldstyle Figures