Definition
Numerals that share the same height — usually cap height — and sit on the baseline. Lining figures are designed for use in tables, all-caps settings, and display work. They are also called titling figures or ranging figures. Compare with old-style (text) figures, which have varying heights and extenders.
Source
— Robert Bringhurst — p. 326:
Numerals that share the same height and sit on the baseline.
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