Editing 0 (section)

==Symbols and representations==
{{Main|Symbols for zero}}
[[File:Text figures 036.svg|71px|alt=horizontal guidelines with a zero touching top and bottom, a three dipping below, and a six cresting above the guidelines, from left to right|left]]
[[File:Oslo airport train station, Platform 0.jpg|thumb|Oslo airport train station, Platform 0]]
Today, the numerical digit 0 is usually written as a circle or ellipse. Traditionally, many print [[typeface]]s made the capital letter [[O]] more rounded than the narrower, elliptical digit 0.<ref name="bemer" /> [[Typewriter]]s originally made no distinction in shape between O and 0; some models did not even have a separate key for the digit 0. The distinction came into prominence on modern character [[Visual display unit|displays]].<ref name="bemer">{{Cite journal |last=Bemer |first=R. W. |year=1967 |title=Towards standards for handwritten zero and oh: much ado about nothing (and a letter), or a partial dossier on distinguishing between handwritten zero and oh |journal=Communications of the ACM |volume=10 |issue=8 |pages=513–518 |doi=10.1145/363534.363563 |s2cid=294510}}</ref>

A [[slashed zero]] (<math>0\!\!\!{/}</math>) is often used to distinguish the number from the letter (mostly in computing, navigation and in the military, for example). The digit 0 with a dot in the center seems to have originated as an option on [[IBM 3270]] displays and has continued with some modern computer typefaces such as [[Andalé Mono]], and in some airline reservation systems. One variation uses a short vertical bar instead of the dot. Some fonts designed for use with computers made the  "0" character more squared at the edges, like a rectangle, and the "O" character more rounded. A further distinction is made in [[FE-Schrift|falsification-hindering typeface]] as used on [[Vehicle registration plates of Germany|German car number plates]] by slitting open the digit 0 on the upper right side. In some systems either the letter O or the numeral 0, or both, are excluded from use, to avoid confusion.