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A numeric display consisting of seven segments per digit, allowing characters 0 to 9 to be displayed by selecting which segment is on or off. Can have each digit independently controlled, or can be multiplexed to reduce pin count. An 8th segment can be included for a decimal point.

Typically referring to LED or LCD displays where 7 segments can be combined to display a numeral between 0 and 9. LED Displays may be arranged as either common anode or common cathode, with independently broken out pins, or multiplexed to reduce pin count.

Typical arrangement of segments:

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Another representation of the 7-segment character showing pinout, circuit diagrams for common anode models and common cathode models:

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(Source)

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