Analog - They usually use a clock face which indicates time using rotating pointers called "hands" on a fixed numbered dial or dials., Digital - Most of these clocks use electronic mechanisms and LCD, LED, or VFD displays; many other display technologies are used as well (cathode-ray tubes, nixie tubes, etc.)., Hybrid (analog-digital) - Clocks with analog quadrants, with a digital component, usually minutes and hours displayed analogously and seconds displayed in digital mode., Auditory - For convenience, distance, telephony or blindness, these clocks present the time as sounds., Word - These clocks are clocks that display the time visually using sentences. E.g.: "It's about three o'clock." These clocks can be implemented in hardware or software., Projection - These clocks include an optical projector that shines a magnified image of the time display onto a screen or onto a surface such as an indoor ceiling or wall., Tactile - These are clocks for the blind that have displays that can be read by using the sense of touch., Multi-display - These clocks have several displays driven by a single mechanism, and some others have several completely separate mechanisms in a single case., Hourglass - Device made of glass and sand that is pouring from one part of the vessel to the other., Sundial - Horological device that tells the time of the day when direct sunlight shines by the apparent position of the Sun in the sky., Water clock - This clock is a timepiece by which time is measured by the regulated flow of liquid into (inflow type) or out from (outflow type) a vessel, and where the amount is then measured., Flying pendulum clock - This clock is a clock that uses a flying pendulum escapement mechanism.,

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