''

	'' '' may refer to: * An empty string * A quotation mark (") * A ditto mark * A double acute accent () * A double grave accent () * An umlaut diacritic () * A diaeresis diacritic The diaeresis ( ; is a diacritical mark used to indicate the separation of two distinct vowels in adjacent syllables when an instance of Hiatus (linguistics), diaeresis (or hiatus) occurs, so as to distinguish from a digraph (orthography), digra ... () {{disambig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Empty String In formal language theory, the empty string, or empty word, is the unique string of length zero. Formal theory Formally, a string is a finite, ordered sequence of characters such as letters, digits or spaces. The empty string is the special case where the sequence has length zero, so there are no symbols in the string. There is only one empty string, because two strings are only different if they have different lengths or a different sequence of symbols. In formal treatments, the empty string is denoted with ε or sometimes Λ or λ. The empty string should not be confused with the empty language ∅, which is a formal language (i.e. a set of strings) that contains no strings, not even the empty string. The empty string has several properties: * , ε, = 0. Its string length is zero. * ε ⋅ s = s ⋅ ε = s. The empty string is the identity element of the concatenation operation. The set of all strings forms a free monoid with respect to ⋅ and ε. * εR = ε. Reversal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Quotation Mark Quotation marks (also known as quotes, quote marks, speech marks, inverted commas, or talking marks) are punctuation marks used in pairs in various writing systems to set off direct speech, a quotation, or a phrase. The pair consists of an opening quotation mark and a closing quotation mark, which may or may not be the same character. Quotation marks have a variety of forms in different languages and in different media. History The single quotation mark is traced to Ancient Greek practice, adopted and adapted by monastic copyists. Isidore of Seville, in his seventh century encyclopedia, , described their use of the Greek ''diplé'' (a Angle bracket, chevron): [13] ⟩ Diplé. Our copyists place this sign in the books of the people of the Church, to separate or to indicate the quotations drawn from the Holy Scriptures. The double quotation mark derives from a marginal notation used in fifteenth-century manuscript annotations to indicate a passage of particular import ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Ditto Mark The ditto mark is a shorthand sign, used mostly in hand-written text, indicating that the words or figures above it are to be repeated. The mark is made using 'a pair of apostrophes'; 'a pair of marks used underneath a word'; the symbol (quotation mark); but the Cambridge Dictionary of Business English on the same page uses the CJK ditto mark or the symbol (right double quotation mark). In the following example, the second line reads "Blue pens, box of twenty". Black pens, box of twenty ... $2.10 Blue " " " " ... $2.35 History Early evidence of ditto marks can be seen on a cuneiform tablet of the Neo-Assyrian period (934–608 BCE) where two vertical marks are used in a table of synonyms to repeat text. In China the corresponding historical mark was two horizontal lines (also the symbol of "two"), found in bronze script from the Zhou Dynasty, as in the example at right (circa 825 BCE). In script form this became , and is now written as ; see iteration ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Double Acute Accent The double acute accent ( ˝ ) is a diacritic mark of the Latin and Cyrillic scripts. It is used primarily in Hungarian or Chuvash, and consequently it is sometimes referred to by typographers as hungarumlaut. The signs formed with a regular umlaut are letters in their own right in the Hungarian alphabet—for instance, they are separate letters for the purpose of collation. Letters with the double acute, however, are considered variants of their equivalents with the umlaut, being thought of as having both an umlaut and an acute accent. Uses Vowel length History Length marks first appeared in Hungarian orthography in the 15th-century Hussite Bible. Initially, only ''á'' and ''é'' were marked, since they are different in quality as well as length. Later ''í'', ''ó'', ''ú'' were marked as well. In the 18th century, before Hungarian orthography became fixed, ''u'' and ''o'' with umlaut + acute (ǘ, ö́) were used in some printed documents. 19th century typographers i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Double Grave Accent The double grave accent ( ̏ ) is a diacritic used in scholarly discussions of the Serbo-Croatian and sometimes Slovene languages. It is also used in the International Phonetic Alphabet. In Serbo-Croatian and Slovenian, double grave accent is used to indicate a short falling tone, though in discussion of Slovenian, a single grave accent is also often used for this purpose. The double grave accent is found in both Latin and Cyrillic; however, it is not used in the everyday orthography of either language, only in discussions of the phonology of these languages. In the International Phonetic Alphabet, the double grave accent is used to indicate extra-low tone. The letters a e i o r u and their Cyrillic equivalents а е и о р у can all be found with the double grave accent. Unicode provides precomposed characters for the uppercase and the lowercase Latin letters but not the Cyrillic letters. The Cyrillic letters can be formed using the combining character for the double ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Umlaut Diacritic The umlaut () is the diacritical mark used to indicate in writing (as part of the letters , , and ) the result of the historical sound shift due to which former back vowels are now pronounced as front vowels (for example , , and as , , and ). (The term ermanicumlaut is also used for the underlying historical sound shift process.) In its contemporary printed form, the mark consists of two dots placed over the letter to represent the changed vowel sound. It looks identical to the diaeresis mark used in other European languages and is represented by the same Unicode code point. The word ''trema'' (french: tréma), used in linguistics and also classical scholarship, describes the form of both the umlaut diacritic and the diaeresis rather than their function and can therefore be used to refer to both. German origin and current usage (literally "changed sound") is the German name of the sound shift phenomenon also known as ''i-mutation''. In German, this term is also used ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]