BASH (Behavioural Analysis and System Heuristics)- is an underlying technology for a number of SEP 12.1 features, and is not limited to Proactive Threat Protection or SONAR. The SEP components heavily based on the BASH technology are Tamper Protection, Suspicious Behaviour Detection/System Change Detection, SONAR, Reputation Submissions.
See here:
About SONAR
Managing SONAR
http://www.symantec.com/connect/articles/symantec-endpoint-protection-terminology-guide-concepts-technologies-terms-part-1-g