Could mean many things from skill index to sport injector
The acronym of the International System of Units is SI, from the French "Système International".
Aggression is not an acronym.
SI is also known as The International System of Units Please, do not mistake SI for the former, now obsolete, designation 'metric system'
in Acronym Finder in Acronym Finder
The acronym may mean "by us for us" and may be a misstatement of the acronym FUBU.
That is not an acronym in any of the Acronym Dictionaries.
As an acronym:
The acronym AQR means Ain't Quite Right.
The acronym ART means Approaching Room Temperature.
Barf is an acronym for "Bile And Regurgitated Food". not slang, but an acronym.
The acronym AHF means Acute Hissy Fit.
The acronym ALS means Absolute Loss of Sanity.