| Acronym | Definition |
|---|
| ATSU➣Air Traffic Services Unit |
| ATSU➣AT Still University of Health Sciences (Kirksville, MO and Mesa, AZ) |
| ATSU➣Accelerator Test Stand Upgrade |
| ATSU➣Apple Type Services for Unicode |
| ATSU➣Association of Time-Sharing Users |
| ATSU➣Access Technology Support Unit (Royal National Institute of the Blind, UK) |