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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 to as beghilos (or ...
Common English idioms support the notion that many English speakers conflate or associate north with up and south with down (e.g. "heading up north", "down south", Down Under), a conflation that can only be understood as learned by repeated exposure to a particular map-orientation convention (i.e. north put at the top of maps). Related idioms ...
The most recent upside down year was 1961, or 2002 if the number 2 is included (in the case of seven-segment displays), and before that were sequentially 1881 and 1691, unless leading zeroes are allowed to be arbitrarily added. In this case, 02020 would be the most recent upside down year.
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. Also, palindromic numbers and strobogrammatic numbers sometimes attract attention of mathematician ambigrammists.
The seats are designed to withstand impacts up to 16 times the force of gravity, so they will remain in place when the plane is upside down. That's why people are asked to be strapped in at ...
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).
Other uses of reverse-motion photography are technical in nature. For example, it is difficult to target helicopter shots precisely. Having the point of view swoop down from the sky into a close-up on a particular object or scene is almost impossible to achieve with a helicopter, since it is almost impossible to end up with a perfectly framed and focused final image.
The face inversion effect is a phenomenon where identifying inverted (upside-down) faces compared to upright faces is much more difficult than doing the same for non-facial objects.