| Abbreviation | Definition |
|---|---|
| PCO | Portal Configuration Object |
| PCOS | Professional Computer Operating System |
| PCP | Paracel Clustering Package |
| PCP | Pattern Classification Program |
| PCPP | Practical Concurrent and Parallel Programming |
| PCQ | Personal Computing Quest |
| PCR | Pen Character Recognition |
| PCR | Peoplesoft CRM Replicator |
| PCRE | Perl Compatible Regular Expression |
| PCRE | Perl Compatible Regular Expressions |
| PCS | Picture Coding Scheme |
| PCS | Picture Coding Symposium |
| PCS | Popular Coding System |
| PCS | Procedural Coding System |
| PCS | procedure coding system |
| PCS | Process Control Software |
| PCS | Product Configuration Software |
| PCSJ | Picture Coding Symposium of Japan |
| PD | Path Difference |
| PD | Pine Download |