Final answer:
In Operations Security, the characteristic that highlights differences between a standard activity profile and the latest actions is known as anomalies or deviations, signifying possible security risks.
Step-by-step explanation:
The OPSEC (Operations Security) indicator characteristic that describes differences between an activity's standard profile and its most recent or current actions is commonly referred to as anomalies or deviations. These are uncharacteristic changes that might signal a potential security risk or vulnerability in operations. By monitoring and analyzing these indicators, organizations can protect sensitive information from being compromised. Variations from the norm can suggest that operational security has been breached or that critical info has leaked, highlighting the need for immediate attention and potential countermeasures.