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X Mark
An X mark (also known as an ex mark or a cross mark or simply an X or ex or a cross) is used to indicate the concept of negation (for example "no, this has not been verified", "no, that is not the correct answer" or "no, I do not agree") as well as an indicator (for example, in election Ballot, ballot papers or in maps as an x marks the spot (other), x-marks-the-spot). Its opposite is often considered to be the marujirushi, O mark used in Japan and Korea or the check mark (✓) used in the West. In Japanese, the X mark (❌) is called "batsu" (ばつ) and can be expressed by someone by crossing their arms. It is also used as a replacement for a signature for a person who is blind or illiterate and thus cannot write their name. Typically, the writing of an X used for this purpose must be witnessed to be valid. Contrary to the negation or negative perception delegated to the letter X, there is a significant resilience in the usage displayed by the letter's placement. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cartesian Product
In mathematics, specifically set theory, the Cartesian product of two sets and , denoted , is the set of all ordered pairs where is an element of and is an element of . In terms of set-builder notation, that is A\times B = \. A table can be created by taking the Cartesian product of a set of rows and a set of columns. If the Cartesian product is taken, the cells of the table contain ordered pairs of the form . One can similarly define the Cartesian product of sets, also known as an -fold Cartesian product, which can be represented by an -dimensional array, where each element is an -tuple. An ordered pair is a 2-tuple or couple. More generally still, one can define the Cartesian product of an indexed family of sets. The Cartesian product is named after René Descartes, whose formulation of analytic geometry gave rise to the concept, which is further generalized in terms of direct product. Set-theoretic definition A rigorous definition of the Cartesian product re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Check Mark
The check or check mark (American English), checkmark ( Philippine English), tickmark ( Indian English) or tick ( Australian, New Zealand and British English) is a mark (✓, ✔, etc.) used in many countries, including the English-speaking world, to indicate the concept "yes" (e.g. "yes; this has been verified", "yes; that is the correct answer", "yes; this has been completed", or "yes; this tem or optionapplies"). The X mark is also sometimes used for this purpose (most notably on election ballot papers, e.g. in the United Kingdom), but otherwise usually indicates "no", incorrectness, or failure. One of the earliest usages of a check mark as an indication of completion is on ancient Babylonian tablets "where small indentations were sometimes made with a stylus, usually placed at the left of a worker's name, presumably to indicate whether the listed ration has been issued." As a verb, to check (off) means to add such a mark. Printed forms, printed documents, and computer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tally Marks
Tally marks, also called hash marks, are a form of numeral used for counting. They can be thought of as a unary numeral system. They are most useful in counting or tallying ongoing results, such as the score in a game or sport, as no intermediate results need to be erased or discarded. However, because of the length of large numbers, tallies are not commonly used for static text. Notched sticks, known as tally sticks, were also historically used for this purpose. Early history Counting aids other than body parts appear in the Upper Paleolithic. The oldest tally sticks date to between 35,000 and 25,000 years ago, in the form of notched bones found in the context of the European Aurignacian to Gravettian and in Africa's Late Stone Age. The so-called '' Wolf bone'' is a prehistoric artifact discovered in 1937 in Czechoslovakia during excavations at Dolní Věstonice, Moravia, led by Karl Absolon. Dated to the Aurignacian, approximately 30,000 years ago, the bone is m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dagger (typography)
A dagger, obelisk, or obelus is a glyph, typographical mark that usually indicates a footnote if an asterisk has already been used. The symbol is also used to indicate death (of people) or extinction (of species or languages). It is one of the modern descendants of the obelus, a mark used historically by scholars as a critical or highlighting indicator in manuscripts. In older texts, it is called an ''obelisk''. A double dagger, or diesis, is a variant with two hilts and crossguards that usually marks a third footnote after the asterisk and dagger. The triple dagger is a variant with three crossguards and is used by Medieval studies, medievalists to indicate another level of notation. History The dagger symbol originated from a variant of the obelus, originally depicted by a plain line or a line with one or two dots . It represented an iron roasting spit, a dart, or the sharp end of a javelin, symbolizing the skewering or cutting out of dubious matter. The obelus is be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saltire
A saltire, also called Saint Andrew's Cross or the crux decussata, is a Heraldry, heraldic symbol in the form of a diagonal cross. The word comes from the Middle French , Medieval Latin ("stirrup"). From its use as field sign, the saltire came to be used in a number of flags, in the 16th century for Flag of Scotland, Scotland and Cross of Burgundy, Burgundy, in the 18th century also as the ensign of the Ensign of the Russian Navy, Russian Navy, and Saint Patrick's Saltire, for Ireland. Notable 19th-century usage includes some of the flags of the Confederate States of America. It is also used in the flag of Jamaica and on Seal (emblem), seals, and as a Charge (heraldry), heraldic charge in Coat of arms, coats of arms. The term saltirewise or in saltire refers to heraldic charges arranged as a diagonal cross. The Escutcheon (heraldry), shield may also be Division of the field, divided per saltire, i.e. diagonally. A warning sign in the shape of a saltire is also used to indicat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Single-letter Second-level Domain
Single-letter second-level domains are domains in which the second-level domain of the domain name consists of only one letter, such as . In 1993, the Internet Assigned Numbers Authority (IANA) explicitly reserved all single-letter and single-digit second-level domains under the top-level domains com, net, and org, and grandfathered those that had already been assigned. In December 2005, ICANN considered auctioning these domain names. Active single-letter domains On December 1, 1993, the Internet Assigned Numbers Authority (IANA) explicitly reserved the remaining single-letter and single-digit domain names. The few domains that were already assigned were grandfathered in and continued to exist. The six single-letter domains in existence at that time under .com, .net and .org were the following: The .org TLD was subsequently reopened for single-letter domain registrations. These and selected other gTLD and ccTLD single-letter domain names currently in use, typically as short ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of International Common Standards
A list of international common and basic technical standards, which have been established worldwide and are related by their frequent and widespread use. These standards are conventionally accepted as best practice and used globally by industry and organizations. In circumstances and situations there are certain methods and systems that are used as benchmarks, guidelines or protocols for communication, measurement, orientation, reference for information, science, symbols and time. These standards are employed to universally convey meaning, classification and to relate details of information. The standards listed may be formal or informal and some might not be recognised by all governments or organizations. Communication *Braille *International Code of Signals *International Maritime Signal Flags *International Phonetic Alphabet In radio communications :* Radiotelephony procedure :* Procedure word :* International Radiotelephony Spelling Alphabet :* Aeronautical Code signals :* ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cross Product
In mathematics, the cross product or vector product (occasionally directed area product, to emphasize its geometric significance) is a binary operation on two vectors in a three-dimensional oriented Euclidean vector space (named here E), and is denoted by the symbol \times. Given two linearly independent vectors and , the cross product, (read "a cross b"), is a vector that is perpendicular to both and , and thus normal to the plane containing them. It has many applications in mathematics, physics, engineering, and computer programming. It should not be confused with the dot product (projection product). The magnitude of the cross product equals the area of a parallelogram with the vectors for sides; in particular, the magnitude of the product of two perpendicular vectors is the product of their lengths. The units of the cross-product are the product of the units of each vector. If two vectors are parallel or are anti-parallel (that is, they are linearly dependent), ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Variadic Function
In mathematics and in computer programming, a variadic function is a function of indefinite arity, i.e., one which accepts a variable number of arguments. Support for variadic functions differs widely among programming languages. The term ''variadic'' is a neologism, dating back to 1936/1937. The term was not widely used until the 1970s. Overview There are many mathematical and logical operations that come across naturally as variadic functions. For instance, the summing of numbers or the concatenation of strings or other sequences are operations that can be thought of as applicable to any number of operands (even though formally in these cases the associative property is applied). Another operation that has been implemented as a variadic function in many languages is output formatting. The C function and the Common Lisp function are two such examples. Both take one argument that specifies the formatting of the output, and ''any number'' of arguments that provide the value ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saltire
A saltire, also called Saint Andrew's Cross or the crux decussata, is a Heraldry, heraldic symbol in the form of a diagonal cross. The word comes from the Middle French , Medieval Latin ("stirrup"). From its use as field sign, the saltire came to be used in a number of flags, in the 16th century for Flag of Scotland, Scotland and Cross of Burgundy, Burgundy, in the 18th century also as the ensign of the Ensign of the Russian Navy, Russian Navy, and Saint Patrick's Saltire, for Ireland. Notable 19th-century usage includes some of the flags of the Confederate States of America. It is also used in the flag of Jamaica and on Seal (emblem), seals, and as a Charge (heraldry), heraldic charge in Coat of arms, coats of arms. The term saltirewise or in saltire refers to heraldic charges arranged as a diagonal cross. The Escutcheon (heraldry), shield may also be Division of the field, divided per saltire, i.e. diagonally. A warning sign in the shape of a saltire is also used to indicat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
