| Acronym | Meaning |
 | PSTN | Public Switched Telephone Network |
| XDSL | X Digital Subscriber Line |
| DINOR | Divided Bit-line NOR |
| GIS | Geographic Information System |
| LIM | Lifeline Interface Module |
| CPU | Central Processing Unit |
| EIDE | Enhanced Intelligent Drive Electronics |
| USENET | User Network |
| ELF | Extremely Low Frequency |
| TOPS | Transparent Operating System |
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