Initialism of level of service.
"The urban planning report used LOS to evaluate traffic flow efficiency at each intersection."
"I found five los in my pocket after buying too many lottery tickets."
Initialism of loan origination system. A software application or ASP solution for originating loans.
"The bank's new LOS streamlined the entire process from credit approval to closing by automating document generation and compliance checks."
The word "los" comes from the Old English lox and originally referred to a type of fish known as pike or perch before its meaning evolved in modern usage. It traveled into Middle English through Proto-West Germanic roots without changing significantly during that transition.