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OS
+++++ operating system
/---- osmium
/---- Out of Stock
AcroLexic: Dictionary of Acronyms and Abbreviations contains 30 more definitions of “OS”.
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See also

Acronym Definitions
POS 29
SOS 28
COS 26
AOS 22
TOS 22
MOS 21
OSP 20
OSS 20
DOS 20
IOS 20
EOS 19
OSC 19
OSA 19
ROS 17
NOS 16
FOS 16
OSM 15
OSR 14
ROSE 14
LOS 13