Number sign
The pound sign ( # ) is used in many areas and with correspondingly different meanings. When naming, there are also (similar to English names ) and number sign or hash mark (even jokingly ) gate and cross bar. In the context of on-screen text, computer keyboards and telephones is often found in spite of the non- diamond shaped sign the name lozenge, with some big telephone PBXs, the designation square. In Switzerland, the name is Gartenhag (Swiss German for garden fence, see Hag ) common in southern Germany and garden fence.
As a number sign, it is especially used in Canada and the United States to mark numbers in numbered lists; here it is preceded by the number. Another use is the pound sign used as symbols of the American pound; In this case, it is adjusted to the number. According to the marked with the sign of telephone key is sometimes referred to as pound key. In other English-speaking regions, among other, the term is used hash sign.
- 3.1 Keyboard
- 3.2 replacement
- 4.1 Table with variants and similar characters
Formation
A ( blank ) theory asserts the pound had probably from the ligature lb for pound: developed ( ℔ for Latin libra " balance, balance, pound ").
Meanings and applications
In the computer science and IT
- In some programming languages (such as C ) as a prefix for preprocessor directives
- Comment character in many programming languages , such as Perl, computer algebra system Maple and. Htaccess
- In ColdFusion, all variables ( database fields ) between two double crosses are set
- Anchor links to an HTML anchor, as a separation from the rest of a URL
- Under Unix-like operating systems featuring the combination of characters #! ( called shebang ) at the beginning of a file as a script program, if the path to the associated interpreter program follows this.
- Under Unix-like operating systems, displays it as a prompt in the shell that it is a root shell
In technology
- Button on the phone (under the Nine ), usually at the beginning or ending of DTMF sequences
- One of several prefixes for names of IRC channels
- When screen text as the terminator for addresses
- In computing machines is the " Not computational button " marked with a double dagger. It causes the last entered digit string as " number" appears on the printout, without being considered in the calculation result ( in accordance with the wording " number sign "). In this role, the character is standardized in DIN ISO 7000 " Graphical symbols for facilities " as a symbol ISO 7000-0657 "non- add " (Eng. " Not Convert ").
In mathematics
- Especially in North America to identify the ordinality of a number, for example "# 1", read " Number 1"
- As an alternative to a pair of vertical bars ( "| |" ) to identify the cardinality of a set
- As a surrogate for parallelogram
Others
- The double cross is not the same as the cross ♯ notation, but is often used as a surrogate, see below.
- In chess notation, the # represents a checkmate the enemy
- In medicine, the # is used as a symbol for bone fractures. For example, a metatarsal fracture with MLC # is abbreviated.
- On some sites the double cross is used as a symbol of metatags or hashtags.
- In heraldic terminology, the double cross is used as a symbol for the color black.
- Etc. In Tables # is often " number " used as a substitute for the word. "# = 10 " for example, then " number = 10".
- When taking notes of interviews the hash is used as surrogate for profanity or vulgar language expressions if the journalist does not want to play in the original outbreaks of the interviewee. It thus takes over the role of the beep in audio recordings.
Representation in computer systems
In the international character encoding system Unicode " #" is at position U 0023 and is there as " Number sign " ( number sign ) indicates. In the ASCII character set, the character is on the same position; in the EBCDIC character set to code position 7Bhex. The HTML character reference is #.
Keyboard
On the German keyboard, the double cross is usually on the key between Ä and Enter. On the Swiss keyboard it is the third assignment on the numeric key 3
On the British keyboard, the double cross is on the same position as on the German keyboard; However, here between the apostrophe key and the Enter key. The U.S. keyboard has the double cross above the numeric key 3 in the top row of keys.
Substitution
Since all modern computer systems and fonts based on Unicode or the older standard ASCII, the character can be easily represented world, processed, transmitted and archived. A replacement for technical reasons is therefore hardly necessary. However, it may in texts of the C programming language by "? =" To be replaced because it is not in the core of the character set of ISO 646. Even if the keyboard you are using does not have the character, it can usually be inserted through a corresponding function of the operating system or the respective text editor.
Symbols
- The musical sharps ♯ (U 266 F, " Musical Sharp Sign" ), which is referred to as "cross", is a separate character. The double cross does not belong to the notation ( music), but is used as a surrogate for ♯.
- In the programming language C # (pronounced "C -Sharp " what the German " Cis " equivalent ) is used instead of the double cross ( musically correct ) symbol ♯.