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Digital clocks typically use the 50 or 60 hertz oscillation of AC power or a 32,768 hertz crystal oscillator as in a quartz clock to keep time. Most digital clocks display the hour of the day in 24-hour format; in the United States and a few other countries, a commonly used hour sequence option is 12-hour format (with some indication of AM or PM).
Because the number 5 is approximately shaped like the letter S, the number 6 like a lowercase b, the number 9 like the letter g, it is possible to play on these similarities to design ambigrams. A good example is the Sochi 2014 (Olympic games) logo where the four glyphs contained in 2014 are exact symmetries of the four letters S, o, i and h ...
Longcase clocks (grandfather clocks) typically use Roman numerals for the hours. Clocks using only Arabic numerals first began to appear in the mid-18th century. [citation needed] The clock face is so familiar that the numbers are often omitted and replaced with unlabeled graduations (marks), particularly in the case of watches. Occasionally ...
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HUD in a BMW E60 The green arrow on the windshield near the top of this picture is a Head-Up Display on a 2013 Toyota Prius. It toggles between the GPS navigation instruction arrow and the speedometer. The arrow is animated to appear scrolling forward as the car approaches the turn. The image is projected without any kind of glass combiner.
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There are homemade versions of the design which employ a 9-minute top rail, with the middle rail representing multiples of 10. KinetiClocK for example, is the newest rolling ball clock design with a focus on simplicity, durability, and aesthetics. Arrow Handicraft also manufactured the coin clock, which used pennies instead of balls.