A segment display is an electronic display that uses some specific number of LEDs to display different characters. Its study helps understanding its advanced uses like LED TVs, etc. Following is a list of some of the segment displays categorised on the basis of the number of LEDs used:

Nixie tubes, LED display and VF display
Seven-segments-display-layout

The most popular in them is a seven-segment display, which uses seven LEDs to display characters.

Uses

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Segment displays are used in various appliances, like in digital clocks, etc.