Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Components (hierarchy name)
4. components (objects parts)
5. [components by specific context]
6. system components
7. electrical system components
8. electron tubes
9. diodes

Anotations

Scope note:

Semiconductor diodes that emit visible or infrared light when voltage is applied to them. They are most commonly used as indicator lamps in electronic devices or in automobiles. More recent applications include signage and illumination.