Umbra in spanish
Umbría
pronunciation: umbɹ̩iɑ part of speech: noun
pronunciation: umbɹ̩iɑ part of speech: noun
In gestures
umbra = umbría.
Example: U denotes the umbra, ie those documents which are clearly relevant (within the shadow of the subject); P denotes the penumbra (the 'twilight zone'); and A denotes alien, ie those documents which are clearly not relevant.