![]() ![]() The symbol "∅" (U+2205) is used in mathematics to refer to the empty set.It also resembles the Greek letters Theta and Phi in some fonts (although usually, the slash is horizontal or vertical, respectively).The slashed zero format causes problems for certain Scandinavian languages - Ø is used as a letter in the Danish, Faroese and Norwegian alphabets, where it represents or.The slashed zero has the disadvantage that it can be confused with several other symbols: When used in HTML, use of these combining characters is valid but not yet supported by all current web browsers for instance, Microsoft Internet Explorer fails to render them. These combining characters overlay the preceding character, giving the effect of the slashed zero. It is treated literally as "a zero that is slashed" and it is coded as two characters, the commonplace zero and then the "combining long solidus overlay" (U+0338). The slashed zero is supported, but not as a distinct single character (or codepoint, in Unicode parlance). Slashed zeroes can also be used on cheques in order to prevent fraud, for example: changing a 0 to an 8. Some cartoons depicted computer users talking in binary code with 1s and 0s using a slashed zero for the 0. 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. 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. The slashed zero, sometimes called communications zero, was used on teleprinter circuits for weather applications. 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 is used in many ASCII graphic sets descended from the default typewheel on the Teletype Model 33. The Slashed zero is used in many Baudot teleprinter applications, specifically the keytop and typepallet that combines "P" and slashed zero. The slashed zero long predates computers, and has been known to have been used in the twelfth and thirteenth centuries.
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