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light-emitting diode: a semiconductor diode that emits light when conducting currentand is used in electronic displays, indoor and outdoor lighting, etc.
Definition from: http://www.dictionary.com/browse/led
Pack of 3.
10 Segment Led Bargraph Light Display Red Yellow Green Blue
10 PACK LED 5mm Blue Water Clear Ultra Bright
10 Pack LED 5mm White Water Clear Ultra Bright
5 PACK Rectangular LED QuasarBrite Red 5mm 2V 635nm