| Acronym | Meaning |
| RCCSD | (spin) Restricted CCSD |
| TIGR | The Institute For Genomic Research |
| ACPD | Alternating Current Potential Drop |
| CIM | Ceramic Injection Molding |
| INDO/SP | Intermediate Neglect Of Differential Overlap/spin Polarization |
| DRAM | Dynamic Random Access Memory |
| CCT | Clean Coal Technology |
| PT2D | Second-order Perturbation Theory (with) Diagonal (part Of Fock Matrix) |
| AFCOP | Active Filler-controlled Pyrolysis |
| PAFT | Program For Alternative Fluorocarbon Toxicology Testing |