of a series may be numbered as 0, such as Ring 0: Birthday or Zork Zero. The Swiss Federal Railways number certain classes of rolling stock from zero, for example, Re 460 000 to 118. In the realm of fiction, Isaac Asimov eventually added a Zeroth Law to his Three Laws of Robotics, essentially making them four laws. A standard roulette wheel contains the number 0 as well as 1-36. It appears in green, so is classed as neither a “red” nor “black” number for betting purposes. The card game Uno has number cards running from 0 to 9 along with special cards, within each coloured suit. See also Zeroth-order approximation Off-by-one error References Citations Sources This article incorporates material taken from zeroth at the Free On-line Dictionary of Computing prior to 1 November 2008 and incorporated under the "relicensing" terms of the GFDL, version 1.3 or later. Ordinal numbers 0 (number)