olemus
anomaalia märk

Wiktionary:
2. (figuratively) a signal; anything that indicates, or is characteristic of, the presence of something else, especially of something undesirable

näiteid
ISO 13372:
vaatluste ja mõõtmistega saadud kujutlus, mis võib viidata ühe või mitme rikke leidumisele
= perception, made by means of human observations and measurements, which may indicate the presence of one or more faults

https://en.wikipedia.org/wiki/Signs_and_symptoms

https://blog.eduonix.com/networking-and-security/common-symptoms-cyberattack/

https://www.nortonlifelockpartner.com/security-center/computer-virus-symptoms.html

https://wethegeek.com/mobile-phone-security/