EFS may refer to: Medicine and science. Embryonal fyn-associated substrate, encoded by the EFS gene. Enhancer-FACS-seq, a medical assay. Estonian Physical Society (Estonian: Eesti Füüsika Selts) Technology. Canon EF-S lens mount. Emergency flotation system, installed on helicopters. Computing. Amazon Elastic File System, a file storage service. Electronic Filing System, of the Singapore Judiciary. Electronic Filing System (USPTO), of United States Patent and Trademark office. Extent File System, used in the IRIX operating system.
https://en.wikipedia.org/wiki/EFS