What does SIS mean in USPS?
This page is about the meanings of the acronym/abbreviation/shorthand SIS in the Miscellaneous field in general and in the USPS terminology in particular.
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SIS also stands for:
- IEEE Swarm Intelligence Symposium
- Paine Webber Group, Inc.
- Psion Software Installation file
- Safety Instrumented System
- SAIL Interface System
... and 88 more »