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180° rotational ambigram saying "Upside Down". [40] "Half-turn" ambigrams or point reflection ambigrams, commonly called "upside-down words", are 180° rotational symmetrical calligraphies. [7] They can be read right side up or upside down, or both. Rotation ambigrams are the most common type of ambigrams for good reason.
Calculator spelling. Calculator spelling is an unintended characteristic of the seven-segment display traditionally used by calculators, in which, when read upside-down, the digits resemble letters of the Latin alphabet. Each digit may be mapped to one or more letters, creating a limited but functional subset of the alphabet, sometimes referred ...
In logic, a set of symbols is commonly used to express logical representation. The following table lists many common symbols, together with their name, how they should be read out loud, and the related field of mathematics.
Turned characters, those that have been rotated 180 degrees and thus appear upside-down (this is the most common); Sideways characters, those that have been rotated 90 degrees counterclockwise (generally the least supported, and used only for a handful of vowels in the Uralic Phonetic Alphabet system).
When reading one line, the lines above and below it appear upside down. However, the writing continues onto the second side of the tablet at the point where it finishes off the first, so if the first side has an odd number of lines, the second will start at the upper left-hand corner, and the direction of writing shifts to top to bottom.
One of the earliest examples of this type is the rabbit–duck illusion, first published in Fliegende Blätter, a German humor magazine. [1] Other classic examples are the Rubin vase , [ 2 ] and the " My Wife and My Mother-in-Law " drawing, the latter dating from a German postcard of 1888.
Updated July 14, 2016 at 9:02 PM. Typos can do more than damage the credibility of a publication. Penguin books in Australia recently had to reprint 7,000 copies of a now-collectible book because ...
A palindrome is a word, number, phrase, or other sequence of symbols that reads the same backwards as forwards, such as madam or racecar, the date "22/02/2022" and the sentence: "A man, a plan, a canal – Panama ". The 19-letter Finnish word saippuakivikauppias (a soapstone vendor), is the longest single-word palindrome in everyday use, while ...