What term is given to the observed physical or mental indications of a condition or illness?

The correct term for observed physical or mental indications of a condition or illness is "signs." Signs are objective findings that can be measured or observed by someone other than the individual experiencing the condition, such as a healthcare professional. For example, a healthcare provider might observe elevated blood pressure or a rash, both of which can be documented and are tangible indicators of a health issue.

In contrast, symptoms refer to the subjective experiences reported by the person affected, such as pain or fatigue, which cannot be directly observed by others. Reactions may indicate the body's response to a treatment or drug but aren’t necessarily tied to the direct indications of an illness. Manifestations are broader terms that can encompass both signs and symptoms but are not exclusively defined as the observed indications alone. Therefore, the term that specifically relates to the observed indicators is "signs."