| Acronym | Meaning |
 | JOR | Jordan (ISO 3166 Trigram) |
| ZR | Zirconium |
| JTN | Johnston Atoll (ISO 3166 Trigram; Obsolete 1986) |
| PPP | Point-to-Point Protocol - Purchasing Power Parity |
| IRL | Ireland (ISO 3166 Trigram) - Industrial Research Limited |
| ROU | Romania (ISO 3166 Trigram) |
| AV | Attovolt |
| RCRA | Resource Conservation And Recovery Act (reck-ra Or Rick-ra) |
| CASE | Cellular Ammunition Storage Equipment - Computer-Aided Software Engineering |
| CLIC | Compact LInear Collider |
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