SIO
SIO is used in tech to mean serial input/output or standard I/O, and in commerce it may signal a seller‑initiated offer or the phrase “serious inquiries only.”
Miscellaneous
Societas Internationalis Odontologica
Standard I O
Single Image Output
Secure Identity Object
Semanticscience Integrated Ontology
Security Intelligence Operations
Strategise Implement Operate
Serial I O
Saptam in One
s for Input Output
Shock Induced Oscillation
Community
Governmental
Senior Investigating Officer
Systems Integration Office
Senior Intelligence Officer
Standard Installation Organization
Special Information Operations
Academic & Science
Skidaway Institute of Oceanography
Scripps Institution of Oceanography
Students Islamic Organisation of India
Silicon Oxide
Students Islamic Organization of India
Student Information Online
Studentsamskipnaden i Oslo
Students Islamic Organisation