A character used to represent one of the non-negative integers smaller than the base, e.g., in decimal notation, one ot the characters 0 to 9.
Reference: ANSI (modified)
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
acceleration due to gravity (m/s2)
International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM