In the same way, diagnostic categories are based on observable features of the child (that is, symptoms) and tell us something about nonobservable features (such as the neural basis or associated risk factors). (educationnext.org)
«Reputational ratings are simply inferences from broad, readily observable features of an institution's identity, such as its history, its prominence in the media, or the elegance of its architecture. (fortune.com)
The measurable quantities in stellar astrophysics include the externally observable features of the stars: distance, temperature, radiation spectrum and luminosity, composition (of the outer layers), diameter, mass, and variability in any of these. (britannica.com)