HS-MR-CCSD: Hilbert Space-Multi-Reference-Coupled Cluster with Single and Double Excitations

What does HS-MR-CCSD mean? The above is one of HS-MR-CCSD meanings. It may have other definitions. Please refer to the end of this passage.

Definition in English: Hilbert Space-Multi-Reference-Coupled Cluster with Single and Double Excitations