| Acronym | Definition |
|---|
| RCSI➣Royal College of Surgeons in Ireland |
| RCSI➣Report of Composting Site Information (recycling; California) |
| RCSI➣Receiver Channel State Information |
| RCSI➣Reactor Coolant System Integrity |
| RCSI➣Random Cooperative Strain Interaction |
| RCSI➣Roadrunner Computer Systems, Inc. (Santa Fe, NM) |