Which is not a type of IPS Signature in hbss?

In HBSS (Host-Based Security System), types of IPS (Intrusion Prevention System) signatures typically include network-based, host-based, and application-based signatures. A type that is not considered an IPS signature in HBSS would be a purely heuristic or behavioral signature, as these do not rely on predefined patterns or signatures but instead analyze the behavior of applications in real-time.