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In technical contexts, "spectral" refers to the distribution of a signal's properties, like energy or power, across different frequencies.

This is the distribution of power over a frequency range, often described using Power Spectral Density (PSD) . It helps engineers see where the "strength" of a signal lies. Light and Imaging: Spectral

The specific mix of wavelengths in a light source. This is used in astronomy to determine what stars are made of or how fast they are moving. In technical contexts, "spectral" refers to the distribution

In medicine, spectral features are used to analyze brain waves (EEG) for tasks like sleep staging. 2. Film and Fiction (The Ghostly) In technical contexts