| Acronym | Meaning |
 | ADS | Active Denial System - Astrophysics Data System - Attention Deficit Syndrome |
| CI | Curie |
| OP | Observation Point/Post |
| ONI | (U.S.) Office Of Naval Intelligence |
| PAYE | Pay As You Earn |
| CIBC | Canadian Imperial Bank Of Commerce (obsolete) |
| CRC | Central RTI Component - Chemical Rubber Company - Christian Reformed Church - Control And Reporting Centre -Costa Rican Col›n (ISO 4217 Currency Code) -Cyclic Redundancy Check |
| CSK | Czechoslovakia (ISO 3166 Trigram; Obsolete Since 1993) |
| DA | Denmark (FIPS 10-4 Country Code) -U.S. Department Of The Army - District Attorney |
| ICBM | Intercontinental Ballistic Missile |
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