The slashed zero
is a representation of the number '0
' (zero), with a slash
through it. Unlike the Scandinavian vowel
' and the "empty set
" symbol '∅
', the slash often touches the walls of the surrounding O shape but does not extend past them on the outside.
It is used as the glyph
for the number 0 on character displays
and some personal computers
to distinguish the letter 'O' from the number '0'.
The slashed zero is used in many ASCII graphic sets descended from the default typewheel
on the Model 33 Teletype
The slashed zero long predates computers, and has been known to have been used in the twelfth and thirteenth centuries.
When personal computers started to become mainstream in the early 1980s, it became one of the things associated with the hacker culture
of the time. Some cartoons depicted computer users talking in binary code
with 1s and 0s using a slashed zero
for the 0.
The use of the Scandinavian vowel ø
in the name of the Hawkwind
-influenced 1980s space-rock
band Underground Zerø
may have been inspired by the usage of the slashed zero
by many computer systems
of the time; which resembled ø (see “Heavy metal umlaut”)
The slashed zero symbol is widely used in written Amateur radio
callsigns, codes for video-games, software product keys, and any other instance when clarity is necessary.
Slashed zeroes can also be used on cheques in order to prevent fraud, for example: changing a 0 to an... Read More