Editing Zero-based numbering (section)

== Other fields ==
The [[year zero]] does not exist in the widely used [[Gregorian calendar]] or in its predecessor, the [[Julian calendar]]. Under those systems, the year [[1&nbsp;BC]] is followed by [[AD&nbsp;1]]. However, there is a year zero in [[astronomical year numbering]] (where it coincides with the Julian year 1&nbsp;BC) and in [[ISO 8601|ISO&nbsp;8601:2004]] (where it coincides with the Gregorian year 1&nbsp;BC), as well as in all [[Buddhist calendar|Buddhist]] and [[Hindu calendar]]s.

In many countries, the [[Storey#European scheme 2|ground floor]] in buildings is considered as floor number&nbsp;0 rather than as the "1st&nbsp;floor", the naming convention usually found in the United States of America. This makes a consistent set with underground floors marked with negative numbers.

While the ordinal of 0 mostly finds use in communities directly connected to mathematics, physics, and computer science, there are also instances in classical music. The composer [[Anton Bruckner]] regarded his early ''Symphony in D minor'' to be unworthy of including in the canon of his works, and he wrote {{lang|de|gilt nicht}} ("doesn't count") on the score and a circle with a crossbar, intending it to mean "invalid". But posthumously, this work came to be known as [[Symphony No. 0 (Bruckner)|''Symphony No.&nbsp;0 in D minor'']], even though it was actually written after [[Symphony No. 1 (Bruckner)|''Symphony No.&nbsp;1 in C minor'']]. There is an even earlier ''Symphony in F minor'' of Bruckner's, which is sometimes called [[Symphony No. 00 (Bruckner)|''No.&nbsp;00'']]. The Russian composer [[Alfred Schnittke]] also wrote a [[Symphony No. 0 (Schnittke)|Symphony No.&nbsp;0]].

In some universities, including Oxford and Cambridge, "week&nbsp;0" or occasionally "noughth week" refers to the week before the first week of lectures in a term. In Australia, some universities refer to this as "O&nbsp;week", which serves as a pun on "[[orientation week]]". As a parallel, the introductory weeks at university educations in [[Sweden]] are generally called {{lang|sv|nollning}} (zeroing).

The [[United States Air Force]] starts basic training each Wednesday, and the first week (of eight) is considered to begin with the following Sunday. The four days before that Sunday are often referred to as "zero week".

[[24-hour clock]]s and the international standard [[ISO&nbsp;8601]] use 0 to denote the first (zeroth) hour of the day, consistent with using the 0 to denote the first (zeroth) minute of the hour and the first (zeroth) second of the minute. Also, the [[12-hour clock]]s used in [[Date and time notation in Japan|Japan]] use 0 to denote the hour immediately after midnight and noon in contrast to 12 used elsewhere, in order to avoid confusion [[12-hour clock#Confusion at noon and midnight|whether 12&nbsp;a.m. and 12&nbsp;p.m. represent noon or midnight]].

[[Robert Crumb]]'s drawings for the first issue of ''[[Zap Comix]]'' were stolen, so he drew a whole new issue, which was published as issue&nbsp;1. Later he re-inked his photocopies of the stolen artwork and published it as issue&nbsp;0.

The [[Brussels ring]] road in Belgium is numbered R0. It was built after the ring road around [[Antwerp]], but Brussels (being the capital city) was deemed deserving of a more basic number. Similarly the (unfinished) orbital motorway around [[Budapest]] in Hungary is called [[M0 motorway|M0]].

Zero is sometimes used [[House numbering|in street addresses]], especially in schemes where even numbers are one side of the street and odd numbers on the other. A case in point is [[Christ Church (Cambridge, Massachusetts)|Christ Church]] on [[Harvard Square]], whose address is 0&nbsp;Garden Street.

Formerly in [[Formula One]], when a defending world champion did not compete in the following season, the number&nbsp;1 was not assigned to any driver, but one driver of the world champion team would carry the number&nbsp;0, and the other, number&nbsp;2. This did happen both in 1993 and 1994 with [[Damon Hill]] carrying the number 0 in both seasons, as defending champion [[Nigel Mansell]] quit after 1992, and defending champion [[Alain Prost]] quit after 1993. However, in 2014 the series moved to drivers carrying career-long personalised numbers, instead of team-allocated numbers, other than the defending champion still having the option to carry number 1. Therefore 0 is no longer used in this scenario. It is not clear if it is available as a driver's chosen number, or whether they must be between 2 and 99, but it has not been used to date under this system.

Some team sports allow 0 to be chosen as a player's [[uniform number]] (in addition to the typical range of 1-99). The NFL voted to allow this from 2023 onwards.

A chronological prequel of a series may be numbered as 0, such as ''[[Ring&nbsp;0: Birthday]]'' or ''[[Zork Zero]]''.

The [[Swiss Federal Railways]] number certain classes of rolling stock from zero, for example, [[SBB-CFF-FFS Re 460|Re&nbsp;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 (card game)|Uno]] has number cards running from 0 to 9 along with special cards, within each coloured suit.

The [[Free_software#Definition|Four Essential Freedoms of Free Software]] are numbered starting from zero. This is for historical reasons: the list originally had only three freedoms, and when the fourth was added it was placed in the zeroth position as it was considered more basic.