Tilde
~ ◌̃ | |
---|---|
Tilde (symbol), Combining tilde (diacritic) | |
See also | |
Double tilde: Approximation [≈] or Double negation [ ~(~ ] |
The tilde (/ˈtɪld, -di, -də, -deɪ/)[1] ˜ or ~, is a grapheme with a number of uses. The name of the character came into English from Spanish, which in turn came from the Latin titulus, meaning 'title' or 'superscription'.[2][a] Its primary use is as a diacritic (accent) in combination with a base letter; but, for historical reasons, it is also used in standalone form within a variety of contexts.
History
Use by medieval scribes
The tilde was originally written over an omitted letter or several letters as a scribal abbreviation, or "mark of suspension" and "mark of contraction",[3] shown as a straight line when used with capitals. Thus, the commonly used words Anno Domini were frequently abbreviated to Ao Dñi, with an elevated terminal with a suspension mark placed over the "n". Such a mark could denote the omission of one letter or several letters. This saved on the expense of the scribe's labor and the cost of vellum and ink. Medieval European charters written in Latin are largely made up of such abbreviated words with suspension marks and other abbreviations; only uncommon words were given in full.
The text of the Domesday Book of 1086, relating for example, to the manor of Molland in Devon (see adjacent picture), is highly abbreviated as indicated by numerous tildes.
The text with abbreviations expanded is as follows:
Mollande tempore regis Edwardi geldabat pro quattuor hidis et uno ferling. Terra est quadraginta carucae. In dominio sunt tres carucae et decem servi et triginta villani et viginti bordarii cum sedecim carucis. Ibi duodecim acrae prati et quindecim acrae silvae. Pastura tres leugae in longitudine et latitudine. Reddit quattuor et viginti libras ad pensam. Huic manerio est adjuncta Blachepole. Elwardus tenebat tempore regis Edwardi pro manerio et geldabat pro dimidia hida. Terra est duae carucae. Ibi sunt quinque villani cum uno servo. Valet viginti solidos ad pensam et arsuram. Eidem manerio est injuste adjuncta Nimete et valet quindecim solidos. Ipsi manerio pertinet tercius denarius de Hundredis Nortmoltone et Badentone et Brantone et tercium animal pasturae morarum.
Role of mechanical typewriters
On
/õ, a single dead-key (rather than take two keys to dedicate) is the most practical solution.The tilde symbol did not exist independently as a movable type or hot-lead printing character since the type cases for Spanish or Portuguese would include sorts for the accented forms.
The centralized ASCII tilde
Serif: | —~— |
Sans-serif: | —~— |
Monospace: | —~— |
A free-standing tilde between two em dashes in three font families |
The first
It appears to have been at their May 13–15, 1963 meeting that the CCITT decided that the proposed ISO 7-bit code standard would be suitable for their needs if a lower case alphabet and five diacritical marks [...] were added to it.[5] At the October 29–31 meeting, then, the ISO subcommittee altered the ISO draft to meet the CCITT requirements, replacing the up-arrow and left-arrow with diacriticals, adding diacritical meanings to the apostrophe and quotation mark, and making the number sign a dual[b] for the tilde.[6]
— Yucca's free information site (which cites the original sources).[7]
Thus ISO 646 was born (and the ASCII standard updated to X3.64-1967), providing the tilde and other symbols as optional characters.[4]: 247 [c]
ISO 646 and ASCII incorporated many of the overprinting lower-case diacritics from typewriters, including tilde. Overprinting was intended to work by putting a
The free-standing tilde is at code 126 in ASCII, where it was inherited into Unicode as U+007E.
A similar shaped mark (⁓) is known in typography and
Connection to Spanish
As indicated by the etymological origin of the word "tilde" in English, this symbol has been closely associated with the
In Spanish itself the word tilde is used more generally for diacritics, including the stress-marking acute accent.[12] The diacritic ~ is more commonly called virgulilla or la tilde de la eñe, and is not considered an accent mark in Spanish, but rather simply a part of the letter ñ (much like the dot over ı makes an i character that is familiar to readers of English).
Usage
Letters with tilde
Unicode encodes a number of cases of "letter with tilde" as precomposed characters and these are displayed below. In addition, many more symbols may be composed using the combining character facility (U+0303 ◌̃ COMBINING TILDE, U+0330 ◌̰ COMBINING TILDE BELOW and others) that may be used with any letter or other diacritic to create a customised symbol but this does not mean that the result has any real-world application and are not shown in the table.
- Tilde ◌̃ Latin: ᵶ
A tilde diacritic can be added to almost any character by using a
Common use in English
The English language does not use the tilde as a diacritic, though it is used in some loanwords. The standalone form of the symbol is used more widely. Informally,[13] it means "approximately", "about", or "around", such as "~30 minutes before", meaning "approximately 30 minutes before".[14][15] It may also mean "similar to",[16] including "of the same order of magnitude as",[13] such as "x ~ y" meaning that x and y are of the same order of magnitude. Another approximation symbol is the double tilde ≈, meaning "approximately/almost equal to".[14][16][17] The tilde is also used to indicate congruence of shapes by placing it over an = symbol, thus ≅.
In more recent digital usage, tildes on either side of a word or phrase have sometimes come to convey a particular tone that "let[s] the enclosed words perform both sincerity and irony", which can pre-emptively defuse a negative reaction.[18] For example, BuzzFeed journalist Joseph Bernstein interprets the tildes in the following tweet:
- "in the ~ spirit of the season ~ will now link to some of the (imho) #Bestof2014 sports reads. if you hate nice things, mute that hashtag."
as a way of making it clear that both the author and reader are aware that the enclosed phrase – "spirit of the season" – "is cliche and we know this quality is beneath our author, and we don't want you to think our author is a cliche person generally".[18][d]
Among other uses, the symbol has been used on social media to indicate sarcasm.[19] It may also be used online, especially in informal writing such as fanfiction, to convey a cutesy, playful, or flirtatious tone.[20]
Diacritical use
In some languages, the tilde is a diacritic mark placed over a letter to indicate a change in its pronunciation:
Pitch
The tilde was firstly used in the
Abbreviation
Later, it was used to make
The tilde was also used occasionally to make other abbreviations, such as over the letter ⟨q⟩, making q̃, to signify the word que ("that").
Nasalization
It is also as a small ⟨n⟩ that the tilde originated when written above other letters, marking a
In Breton, the symbol ⟨ñ⟩ after a vowel means that the letter ⟨n⟩ serves only to give the vowel a nasalised pronunciation, without being itself pronounced, as it normally is. For example, ⟨an⟩ gives the pronunciation [ãn] whereas ⟨añ⟩ gives [ã].
In the DMG romanization of Tunisian Arabic, the tilde is used for nasal vowels õ and ṏ.
Palatal n
The tilded ⟨n⟩ (⟨ñ⟩, ⟨Ñ⟩) developed from the digraph ⟨nn⟩ in Spanish. In this language, ⟨ñ⟩ is considered a separate letter called
Tone
In Vietnamese, a tilde over a vowel represents a creaky rising tone (ngã). Letters with the tilde are not considered separate letters of the Vietnamese alphabet.
International Phonetic Alphabet
In
- A tilde above a letter indicates nasalization, e.g. [ã], [ṽ].
- A tilde superimposed onto the middle of a letter indicates velarization or pharyngealization, e.g. [ɫ], [z̴]. If no precomposed Unicode character exists, the Unicode character U+0334 ◌̴ COMBINING TILDE OVERLAY can be used to generate one.
- A tilde below a letter indicates laryngealisation, e.g. [d̰]. If no precomposed Unicode character exists, the Unicode character U+0330 ◌̰ COMBINING TILDE BELOW can be used to generate one.
Letter extension
In Estonian, the symbol ⟨õ⟩ stands for the close-mid back unrounded vowel, and it is considered an independent letter.
Other uses
Some languages and alphabets use the tilde for other purposes, such as:
- آ⟩, denoting a long /ʔaː/ sound.
- velar nasal consonant. Also, the tilded ⟨y⟩ (⟨Ỹ⟩) stands for the nasalized upper central rounded vowel [ɨ̃]. Munduruku, Parintintín, and two older spellings of Filipino words also use ⟨g̃⟩.
- Estonian and Võro use the tilde above the letter o (õ) to indicate the vowel [ɤ], a rare sound among languages.
- middle tone in linguistic transcription of certain dialects of the Lithuanian language.[24]
Punctuation
The tilde is used in various ways in punctuation, such as:
Range
In some languages (though not generally in English), a tilde or a tilde-like
Approximation
Before a number the tilde can mean 'approximately'; '~42' means 'approximately 42'.
The symbols ≈ (almost equal to) and ≅ (approximately equal to) are among the other symbols used to express approximation.
Japanese
The wave dash (波ダッシュ, nami dasshu) is used for various purposes in Japanese, including to denote ranges of numbers (e.g., 5〜10 means between 5 and 10) in place of dashes or brackets, and to indicate origin. The wave dash is also used to separate a title and a subtitle in the same line, as a colon is used in English.
When used in conversations via email or instant messenger it may be used as a
The sign is used as a replacement for the chōon, katakana character, in Japanese, extending the final syllable.
Unicode and Shift JIS encoding of wave dash
In practice the full-width tilde (全角チルダ, zenkaku chiruda) (Unicode U+FF5E ~ FULLWIDTH TILDE), is often used instead of the wave dash (波ダッシュ, nami dasshu) (Unicode U+301C 〜 WAVE DASH), because the Shift JIS code for the wave dash, 0x8160, which should be mapped to U+301C,[28][29] is instead mapped to U+FF5E[30] in Windows code page 932 (Microsoft's code page for Japanese), a widely used extension of Shift JIS.
This decision avoided a shape definition error in the original (6.2) Unicode code charts:[31] the wave dash reference glyph in JIS / Shift JIS[32][33] matches the Unicode reference glyph for U+FF5E FULLWIDTH TILDE,[34] while the original reference glyph for U+301C[31] was reflected, incorrectly,[35] when Unicode imported the JIS wave dash. In other platforms such as the classic Mac OS and macOS, 0x8160 is correctly mapped to U+301C. It is generally difficult, if not impossible, for users of Japanese Windows to type U+301C, especially in legacy, non-Unicode applications.
A similar situation exists regarding the Korean
The current Unicode reference glyph for U+301C has been corrected[35] to match the JIS standard[41] in response to a 2014 proposal, which noted that while the existing Unicode reference glyph had been matched by fonts from the discontinued Windows XP, all other major platforms including later versions of Microsoft Windows shipped with fonts matching the JIS reference glyph for U+301C.[42]
The JIS / Shift JIS wave dash is still formally mapped to U+301C as of JIS X 0213,[43] whereas the WHATWG Encoding Standard used by HTML5 follows Microsoft in mapping 0x8160 to U+FF5E.[44] These two code points have a similar or identical glyph in several fonts, reducing the confusion and incompatibility.
Mathematics
As a unary operator
A tilde in front of a single quantity can mean "approximately", "about"[14] or "of the same order of magnitude as."
In written mathematical logic, the tilde represents negation: "~p" means "not p", where "p" is a proposition. Modern use often replaces the tilde with the negation symbol (¬) for this purpose, to avoid confusion with equivalence relations.
As a relational operator
In mathematics, the tilde operator (which can be represented by a tilde or the dedicated character U+223C ∼ TILDE OPERATOR), sometimes called "twiddle", is often used to denote an equivalence relation between two objects. Thus "x ~ y" means "x is equivalent to y". It is a weaker statement than stating that x equals y. The expression "x ~ y" is sometimes read aloud as "x twiddles y", perhaps as an analogue to the verbal expression of "x = y".[45]
The tilde can indicate approximate equality in a variety of ways. It can be used to denote the asymptotic equality of two functions. For example, f (x) ~ g(x) means that .[13]
A tilde is also used to indicate "approximately equal to" (e.g. 1.902 ~= 2). This usage probably developed as a typed alternative to the libra symbol used for the same purpose in written mathematics, which is an equal sign with the upper bar replaced by a bar with an upward hump, bump, or loop in the middle (︍︍♎︎) or, sometimes, a tilde (≃). The symbol "≈" is also used for this purpose.
In physics and astronomy, a tilde can be used between two expressions (e.g. h ~ 10−34 J s) to state that the two are of the same order of magnitude.[13]
In statistics and probability theory, the tilde means "is distributed as";[13] see random variable(e.g. X ~ B(n,p) for a binomial distribution).
A tilde can also be used to represent geometric similarity (e.g. ∆ABC ~ ∆DEF, meaning triangle ABC is similar to DEF). A triple tilde (≋) is often used to show congruence, an equivalence relation in geometry.
In graph theory, the tilde can be used to represent adjacency between vertices. The edge connects vertices and which can be said to be adjacent, and this adjacency can be denoted .
As a diacritic
The symbol "" is pronounced as "eff tilde" or, informally, as "eff twiddle".[46][47] This can be used to denote the Fourier transform of f, or a lift of f, and can have a variety of other meanings depending on the context.
A tilde placed below a letter in mathematics can represent a vector quantity (e.g. ).
In statistics and probability theory, a tilde placed on top of a variable is sometimes used to represent the median of that variable; thus would indicate the median of the variable . A tilde over the letter n () is sometimes used to indicate the harmonic mean.
In machine learning, a tilde may represent a candidate value for a cell state in
Physics
Often in
A tilde is also used in
In multibody mechanics, the tilde operator maps three-dimensional vectors to skew-symmetrical matrices (see [48] or [49]).
Economics
For relations involving preference, economists sometimes use the tilde to represent indifference between two or more bundles of goods. For example, to say that a consumer is indifferent between bundles x and y, an economist would write x ~ y.
Electronics
It can approximate the sine wave symbol (∿, U+223F), which is used in electronics to indicate alternating current, in place of +, −, or ⎓ for direct current.
Linguistics
The tilde may indicate alternating
The tilde may represent some sort of phonetic or phonemic variation between two sounds, which might be allophones or in free variation. For example, [χ ~ x] can represent "either [χ] or [x]".
In
Computing
Directories and URLs
On
Used in
In URLs, the characters %7E (or %7e) may substitute for a tilde if an input device lacks a tilde key.[55] Thus, http://www.example.com/~johndoe/ and http://www.example.com/%7Ejohndoe/ will behave in the same manner.
Computer languages
The tilde is used in the AWK programming language as part of the pattern match operators for regular expressions:
variable ~ /regex/
returns true if the variable is matched.variable !~ /regex/
returns false if the variable is matched.
A variant of this, with the plain tilde replaced with =~
, was adopted in
In APL and MATLAB, tilde represents the monadic logical function NOT, and in APL it additionally represents the dyadic multiset function without (set difference).
In
~~x
as a short syntax for a cast to integer (numbers are stripped of their decimal part and changed into their complement, and then back).
In C++ and C#, the tilde is also used as the first character in a
In ASP.NET application tilde ('~') is used as a shortcut to the root of the application's virtual directory.
In the
In the
In Eiffel, the tilde is used for object comparison. If a and b denote objects, the boolean expression a ~ b has value true if and only if these objects are equal, as defined by the applicable version of the library routine is_equal, which by default denotes field-by-field object equality but can be redefined in any class to support a specific notion of equality. If a and b are references, the object equality expression a ~ b is to be contrasted with a = b which denotes reference equality. Unlike the call a.is_equal (b), the expression a ~ b is type-safe even in the presence of covariance.
In the
=~
and ==~
can in Groovy be used to match a regular expression.[58][59]In
In the Inform programming language, the tilde is used to indicate a quotation mark inside a quoted string.
In "text mode" of the LaTeX typesetting language a tilde diacritic can be obtained using, e.g., \~{n}
, yielding "ñ". A stand-alone tilde can be obtained by using \textasciitilde
or \string~
.
In "math mode" a tilde diacritic can be written as, e.g., \tilde{x}
. For a wider tilde \widetilde
can be used. The \sim
command produce a tilde-like binary relation symbol that is often used in mathematical expressions, and the double-tilde
\approx
. The url
package also supports entering tildes directly, e.g., \url{http://server/~name}
.
In both text and math mode, a tilde on its own (~
) renders a white space with no line breaking.
In MediaWiki syntax, four tildes are used as a shortcut for a user's signature.
In Common Lisp, the tilde is used as the prefix for format specifiers in format strings.[62]
In
In Standard ML, the tilde is used as the prefix for negative numbers and as the unary negation operator.
In OCaml, the tilde is used to specify the label for a labeled parameter.
In R, the tilde operator is used to separate the left- and right-hand sides in a model formula.[63]
In Object REXX, the twiddle is used as a "message send" symbol. For example, Employee.name~lower()
would cause the lower()
method to act on the object Employee
's name
attribute, returning the result of the operation. ~~
returns the object that received the method rather than the result produced. Thus it can be used when the result need not be returned or when cascading methods are to be used. team~~insert("Jane")~~insert("Joe")~~insert("Steve")
would send multiple concurrent insert
messages, thus invoking the insert
method three consecutive times on the team
object.
In Raku, ~~
is used instead of =~
for a regular expression. Because the dot operator is used for member access instead of ->
, concatenation is done with a single tilde.
my $concatResult = "Hello " ~ "world!";
$concatResult ~~ /<|w><[A..Z]><[a..z]>*<|w>/;
say $/; # outputs "Hello"
# the $/ variable holds the last regex match result
Keyboards
The presence (or absence) of a tilde engraved on the keyboard depends on the territory where it was sold. In either case, computer's system settings determine the
- With US-international, the `/~ key is a dead key: pressing the ~ key and then a letter produces the tilde-accented form of that letter. (For example, ~ a produces ã.) With this setting active, an ASCII tilde can be inserted with the dead key followed by the space bar, or alternatively by striking the dead key twice in a row.
- With UK-extended, the key works normally but becomes a 'dead key' when combined with AltGr. Thus AltGr+# followed by a letter produces the accented form of that letter.
- With a Mac either of the Alt/Option keys function similarly.
- With Linux, the compose key facility is used.
Instructions for other national languages and keyboards are beyond the scope of this article.
In the US and European
126
.
Backup filenames
The dominant Unix convention for naming backup copies of files is appending a tilde to the original file name. It originated with the Emacs text editor[64] and was adopted by many other editors and some command-line tools.
Emacs also introduced an elaborate numbered backup scheme, with files named filename.~1~, filename.~2~ and so on. It didn't catch on, as the rise of version control software eliminates the need for this usage.
Microsoft filenames
The tilde was part of Microsoft's filename mangling scheme when it extended the FAT file system standard to support long filenames for Microsoft Windows. Programs written prior to this development could only access filenames in the so-called 8.3 format—the filenames consisted of a maximum of eight characters from a restricted character set (e.g. no spaces), followed by a period, followed by three more characters. In order to permit these legacy programs to access files in the FAT file system, each file had to be given two names—one long, more descriptive one, and one that conformed to the 8.3 format. This was accomplished with a name-mangling scheme in which the first six characters of the filename are followed by a tilde and a digit. For example, "Program Files" might become "PROGRA~1".
The tilde symbol is also often used to prefix hidden temporary files that are created when a document is opened in Windows. For example, when a document "Document1.doc" is opened in Word, a file called "~$cument1.doc" is created in the same directory. This file contains information about which user has the file open, to prevent multiple users from attempting to change a document at the same time.
Juggling notation
In the juggling notation system Beatmap, tilde can be added to either "hand" in a pair of fields to say "cross the arms with this hand on top". Mills' Mess is thus represented as (~2x,1)(1,2x)(2x,~1)*.[65]
See also
- Circumflex
- Caret (computing)
- Tittle
- Double tilde (disambiguation)
- Backtick
Notes
- ^ Several more or less common informal names are used for the tilde that usually describe the shape, including squiggly, squiggle(s), and flourish.
- ^ alternative association for the same code point
- code points that are available for national variation. With the arrival of 8-bit "extended ASCII", this issue was largely mitigated, though not fully resolved until Unicodewas established.
- ^ See also Air quotes.
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El autor usaba fuentes propias para representar fenómenos propios de algunos de los dialectos del euskera. Estos son los caracteres especiales utilizados en el diccionario: ã d̃ ẽ ĩ l̃ ñ õ s̃ t̃ ũ x̃.
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{{citation}}
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