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SO/SI

SO/SI

Code

Meaning

Language

Themes and places

SO/SI

Space Operations and Scientific Investigation

Astronomy
Astronautics

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Ackr catalogs and defines acronyms, initialisms, symbols and other abbreviations, that is concise modes of expression, both in writing and orally. As a multilingual dictionary of abbreviations, Ackr lists and translates abbreviations from many places and in many languages.