|
Palindrome
A palindrome (Help:IPA/English, /ˈpæl.ɪn.droʊm/) is a word, palindromic number, number, phrase, or other sequence of symbols that reads the same backwards as forwards, such as ''madam'' or ''racecar'', the date "Twosday, 02/02/2020" and the sentence: "A man, a plan, a canal – Panama". The 19-letter Finnish language, Finnish word ''saippuakivikauppias'' (a soapstone vendor) is the longest single-word palindrome in everyday use, while the 12-letter term ''tattarrattat'' (from James Joyce in ''Ulysses (novel), Ulysses'') is the longest in English. The word ''palindrome'' was introduced by English poet and writer Henry Peacham (born 1578), Henry Peacham in 1638.Henry Peacham, ''The Truth of our Times Revealed out of One Mans Experience'', 1638p. 123 The concept of a palindrome can be dated to the 3rd-century BCE, although no examples survive. The earliest known examples are the 1st-century CE Latin acrostic word square, the Sator Square (which contains both word and senten ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ambigram Palindrome ΝΙΨΟΝΑΝΟΜΗΜΑΤΑΜΗΜΟΝΑΝΟΨΙΝ (Wash Your Sins, Not Only Your Face, In Greek)
An ambigram is a calligraphic composition of glyphs (letters, numbers, symbols or other shapes) that can yield different meanings depending on the orientation of observation. Most ambigrams are visual palindromes that rely on some kind of symmetry, and they can often be interpreted as visual puns. The term was coined by Douglas Hofstadter in 1983–1984. Most often, ambigrams appear as visually symmetrical words. When flipped, they remain unchanged, or they mutate to reveal another Semantics, meaning. "Half-turn" ambigrams undergo a point reflection (180-degree rotational symmetry) and can be read upside down (for example, the word "swims"), while mirror ambigrams have axial symmetry and can be read through a reflective surface like a mirror. Many other types of ambigrams exist. Ambigrams can be constructed in various Written language, languages and alphabets, and the notion often extends to numbers and other symbols. It is a recent interdisciplinary concept, combining Visual arts ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sator Square
The Sator Square (or Rotas-Sator Square or Templar Magic Square) is a two-dimensional acrostic class of word square containing a five-word Latin palindrome. The earliest squares were found at Roman-era sites, all in ROTAS-form (where the top line is "ROTAS", not "SATOR"), with the earliest discovery at Pompeii (and also likely pre-AD 62). The earliest square with Christian-associated imagery dates from the sixth century. By the Middle Ages, Sator squares had been found across Europe, Asia Minor, and North Africa. In 2022, the ''Encyclopedia Britannica'' called it "the most familiar lettered square in the Western world". A significant volume of academic research has been published on the square, but after more than a century, there is no consensus on its origin and meaning. The discovery of the "Paternoster theory" in 1926 led to a brief consensus among academics that the square was created by early Christians, but the subsequent discoveries at Pompeii led many academics to b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Palindromic Number
A palindromic number (also known as a numeral palindrome or a numeric palindrome) is a number (such as 16361) that remains the same when its digits are reversed. In other words, it has reflectional symmetry across a vertical axis. The term ''palindromic'' is derived from palindrome, which refers to a word (such as ''rotor'' or ''racecar'') whose spelling is unchanged when its letters are reversed. The first 30 palindromic numbers (in decimal) are: : 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 22, 33, 44, 55, 66, 77, 88, 99, 101, 111, 121, 131, 141, 151, 161, 171, 181, 191, 202, ... . Palindromic numbers receive most attention in the realm of recreational mathematics. A typical problem asks for numbers that possess a certain property ''and'' are palindromic. For instance: * The palindromic primes are 2, 3, 5, 7, 11, 101, 131, 151, ... . * The palindromic square numbers are 0, 1, 4, 9, 121, 484, 676, 10201, 12321, ... . In any base there are infinitely many palindromic numbers, since ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Twosday
Twosday was an unofficial one-time secular observance held on Tuesday, February 22, 2022, characterized as a fad. The name is a portmanteau of ''two'' and ''Tuesday'', deriving from the fact that the digits of the date form a numeral palindrome marked by exclusivity or prevalence of the digit 2—when written in different numerical date formats, such as: , 22/2/22 and 2/22/22. It is also an ambigram. In countries that apply the ISO 8601 international standard for the calendar, there is an additional congruence as Tuesday is the second day of the week under this scheme. Anticipation The attraction to the date is due to apophenia. Twosday was described by '' How Stuff Works'' as an example of humans being conditioned under societal institutions to notice only some while ignoring other coincidences that surround them. Attraction to numerology was cited as a reason as well. According to University of Portland professor Aziz Inan, the palindrome is one of the "ubiquitous p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Palindromic Sequence
A palindromic sequence is a nucleic acid sequence in a double-stranded DNA or RNA molecule whereby reading in a certain direction (e.g. 5' to 3') on one strand is identical to the sequence in the same direction (e.g. 5' to 3') on the complementary strand. This definition of palindrome thus depends on complementary strands being palindromic of each other. The meaning of palindrome in the context of genetics is slightly different from the definition used for words and sentences. Since a double helix is formed by two paired antiparallel strands of nucleotides that run in opposite directions, and the nucleotides always pair in the same way (adenine (A) with thymine (T) in DNA or uracil (U) in RNA; cytosine (C) with guanine (G)), a (single-stranded) nucleotide sequence is said to be a palindrome if it is equal to its reverse complement. For example, the DNA sequence ACCTAGGT is palindromic with its nucleotide-by-nucleotide complement TGGATCCA because reversing the order of the n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crab Canon
A crab canon (also known by the Latin form of the name, ''canon cancrizans''; as well as ''retrograde canon'', ''canon per recte et retro'' or ''canon per rectus et inversus'')Kennedy, Michael (ed.). 1994. "Canon". The Oxford Dictionary of Music, associate editor, Joyce Bourne. Oxford and New York: Oxford University Press. . is an arrangement of two musical lines that are complementary and backward. If the two lines were placed next to each other (as opposed to stacked), the lines would form something conceptually similar to a palindrome. The name 'crab' refers to the fact that crabs are known to walk backward (although they can also walk forward and sideways). It originally referred to a kind of canon in which one line is played backward (e.g. FABACEAE played simultaneously with EAECABAF). An example is found in J. S. Bach's '' The Musical Offering'', which also contains a table canon ("Quaerendo invenietis"), which combines retrogression with inversion by having one player ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sotades
Sotades (; 3rd century BC) was an Ancient Greek poet. Sotades was born in Maroneia, either the one in Thrace, or in Crete. He lived in Alexandria during the reign of Ptolemy II Philadelphus (285–246 BC). The city was at that time a remarkable center of learning, with a great deal of artistic and literary activity, including epic poetry and the Great Library. Only a few genuine fragments of his work have been preserved; those in Stobaeus are generally considered spurious. Ennius translated some poems of this kind, included in his book of satires under the name of Sota. He had a son named Apollonius. He has been credited with the invention of the palindrome. Sotades was the chief representative of the writers of obscene and even satirical poems, called "kinaidoi" (), composed in the Ionic dialect and in the metre named after him. One of his poems attacked Ptolemy II Philadelphus's marriage to his own sister Arsinoe II, from which came the infamous line: "You're sticking you ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Regular Language
In theoretical computer science and formal language theory, a regular language (also called a rational language) is a formal language that can be defined by a regular expression, in the strict sense in theoretical computer science (as opposed to many modern regular expression engines, which are Regular expression#Patterns for non-regular languages, augmented with features that allow the recognition of non-regular languages). Alternatively, a regular language can be defined as a language recognised by a finite automaton. The equivalence of regular expressions and finite automata is known as Kleene's theorem (after American mathematician Stephen Cole Kleene). In the Chomsky hierarchy, regular languages are the languages generated by regular grammar, Type-3 grammars. Formal definition The collection of regular languages over an Alphabet (formal languages), alphabet Σ is defined recursively as follows: * The empty language ∅ is a regular language. * For each ''a'' ∈ Σ (''a'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acrostic
An acrostic is a poem or other word composition in which the ''first'' letter (or syllable, or word) of each new line (or paragraph, or other recurring feature in the text) spells out a word, message or the alphabet. The term comes from the French from post-classical Latin , from Koine Greek , from Ancient Greek "highest, topmost" and "verse". As a form of constrained writing, an acrostic can be used as a mnemonic device to aid memory retrieval. When the ''last'' letter of each new line (or other recurring feature) forms a word it is called a telestich (or telestic); the combination of an acrostic and a telestich in the same composition is called a double acrostic (e.g. the first-century Latin Sator Square). Acrostics are common in medieval literature, where they usually serve to highlight the name of the poet or his patron, or to make a prayer to a saint. They are most frequent in verse works but can also appear in prose. The Middle High German poet Rudolf von Ems for ex ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Word Square
A word square is a type of acrostic. It consists of a set of words written out in a square grid, such that the same words can be read both horizontally and vertically. The number of words, which is equal to the number of letters in each word, is known as the "order" of the square. For example, this is an order 5 square: A popular puzzle dating well into ancient times, the word square is sometimes compared to the numerical magic square, though apart from the fact that both use square grids there is no real connection between the two. Early history Sator Square The first-century Sator Square is a Latin word square, which the ''Encyclopedia Britannica'' called "the most familiar lettered square in the Western world". Its canonical form reads as follows: In addition to satisfying the basic properties of word squares, it is palindromic; it can be read as a 25-letter palindromic sentence (of an obscure meaning) and it is speculated that it includes several additional hidden word ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sator Square At Oppède
Sator may refer to: * Šator, a mountain in Bosnia and Herzegovina * Sator (band), a Swedish band * ''Sator'' (film), a 2020 American supernatural horror film * ''Sator'' (lizard), a genus of lizard * Sator bean (''Parkia speciosa''), or stink bean, a bean with a strong smell popular in South East Asian cuisine * Sator Square The Sator Square (or Rotas-Sator Square or Templar Magic Square) is a two-dimensional acrostic class of word square containing a five-word Latin palindrome. The earliest squares were found at Roman-era sites, all in ROTAS-form (where the top l ... (or Rotas Square), a first-century word square containing a five-word Latin palindrome * Sator (the "Sower"), a minor Roman agricultural deity or cult title * Andrei Sator, a character from the film '' Tenet'' People with the surname * Klaus Sator (born 1956), German historian * László Sátor (born 1953), Hungarian racewalker * Ted Sator (born 1949), American ice hockey coach {{disambiguation, su ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Century Dictionary
''The Century Dictionary and Cyclopedia'' is one of the largest encyclopedic dictionaries of the English language. It was compared favorably with the ''Oxford English Dictionary,'' and frequently consulted for more factual information than would normally be the case for a dictionary. History The ''Century Dictionary'' is based on '' The Imperial Dictionary of the English Language'', edited by Rev. John Ogilvie (1797–1867) and published by W. G. Blackie and Co. of Scotland, 1847–1850, which in turn is an expansion of the 1841 second edition of Noah Webster's ''American Dictionary''. In 1882 The Century Company of New York bought the American rights to ''The Imperial Dictionary'' from Blackie and Son. The first edition of the ''Century Dictionary'' was published from 1889 to 1891 by The Century Company, and was described as "six volumes in twenty four". The first edition runs to 7,046 pages and features some 10,000 wood-engraved illustrations. It was edited by Sanskrit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
