| Acronym | Meaning |
 | ISST | International Subcommission On Stratigraphic Terminology |
| MSS | Mobile Servicing Station [space Station] |
| VRIOSA | Vibrational/rotational Infinite-order Sudden Approximation |
| CAPP | Computer Aided Process Planning |
| LOA | Linear Optical Amplifier |
| 2PH TDA | Two-particle-hole Tamm-Dancoff Approximation (for Closed-shell |
| GSMT | Giant Segmented Mirror Telescope |
| UAM-IV | Urban Airshed Model Version IV |
| ROP | Ring-opening Polymerization |
| ETP | Environmental Tracking Procedure |
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