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OLS
+++++ optical line scanner
++/-- ordinary least squares
+/--- online library system
AcroLexic: Dictionary of Acronyms and Abbreviations contains 11 more definitions of “OLS”.
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See also

Acronym Definitions
OLSS 3
DROLS 3
SOLSTICE 2
UNOLS 2
MOLS 2
OLSP 2
POLST 1
VOLSTORAGE 1