Numerals. They are either Roman, made with letters of the Alphabet, for example, MIDCCLXXVI; or they are Arabic, as follows, 1776. 2. Roman figures may be used in contracts and law proceedings, and they will be held valid; but Arabic figures, probably owing to the case with which they may be counterfeited, or. altered, have been holden not to be sufficient to express the sum due on a contract; but, it seems, that if the amount payable and due on a promissory note be expressed in figures or ciphers, it will be valid. Indictments have been set aside because the day or year was expressed in figures. 3. Bills of exchange, promissory notes, cheeks and agreements of every description, are usually dated with Arabic figures; it is, however, better to date deeds and other formal instruments, by writing the words at length.
FIGURES
TheLaw.com Law Dictionary & Black's Law Dictionary 2nd Ed.