| English thesaurus | |||
| |||
| OCS (new name for 4 state customer barcode USPS 2006) | |||
|
One Code : 35 phrases in 13 subjects |
| Astronautics | 1 |
| Computer networks | 1 |
| Computers | 1 |
| Electronics | 9 |
| Information technology | 8 |
| Law | 1 |
| Machine tools | 1 |
| Mass media | 1 |
| Medical | 1 |
| Military | 1 |
| Nautical | 1 |
| Pharmacy and pharmacology | 1 |
| Programming | 8 |