Slashed zero

The slashed zero is also used in charting and documenting in the medical and healthcare fields to avoid confusion with the letter "O".

It also denotes an absence of something (similar to the usage of an "empty set" character), such as a sign or a symptom.

It is used in many Baudot teleprinter applications, specifically the keytop and typepallet that combines "P" and slashed zero.

[4] Additionally, the slashed zero is used in many ASCII graphic sets descended from the default typewheel on the Teletype Model 33.

Along with the Westminster, MICR, and OCR-A fonts, the slashed zero became one of the things associated with hacker culture in the 1980s.

Some cartoons depicted computer users talking in binary code with 1s and 0s using a slashed zero for the 0.

Slashed zeroes have been used in the Flash-based artwork of Young-Hae Chang Heavy Industries, notably in their 2003 work, Operation Nukorea.

Appending Variation Selector 1 U+FE00 after the zero creates the "short diagonal stroked form",[7] on this browser it produces 0︀.

[7] Prior to Unicode 9.0, there was no code point defined for altering the visual appearance of zero.

This meant that the slashed zero glyph was displayed for U+0030 only—and then always—in fonts whose designer chose the option.

In the FE-Schrift typeface, used on German car license plates, the zero is rectangular and has an "insinuated" slash: a diagonal crack just beneath the top right curve.

In some fonts the IPA letter for a bilabial click (ʘ) looks similar to the dotted zero.

Some Burroughs/Unisys equipment displays a zero with a reversed slash, similar to the no symbol, 🛇, as does the free typeface Atkinson Hyperlegible.